6 Ways to Learn Logic Online With Zero Budget


Logic and knowing logical fallacies can be an indispensable tool in apologetics. Before you answer any questions from skeptics, logic can dismantle it before hand by pointing out that it is an invalid argument. Another is that pointing out fallacies will keep you in focus on the argument itself and avoid wandering to unnecessary arguments.

I belong to a Facebook group that discusses theology. And when you discuss theology you’ll inevitably invite folks for a discussion often swelling to a friendly debate. Some do have strong arguments and some do not. One of the things I noticed is that some have invalid arguments that they would drag again and again that doesn’t merit anything with the discussion. Sadly they think they are making points on their arguments but in reality they are not.

As Christians we need to please God not just by showing respect and humility in answering but also responding in a clear and logical way. The way we think matters to God also.

So before you channel your inner Josh McDowell or Greg Bahnsen (LOL), here’s six ways to learn logic and logical fallacies without opening your wallet.

Read what’s it all about

Before we go to the entree, here are some starters that you might want to check out:

The Fallacy Detectives – A superb site on learning logic and its fallacies. This Frequently Asked Questions about Logic article is a great starting point to know about it. Mostly questions floating in your mind are answered here.

Got Questions? How should a Christian view logic? is an excellent question (with an excellent answer) that will set why do we need logic in our arguments. 

Truthbomb Apologetics – The 10 Commandments of Logic  is your first dip to the different logical fallacies that you will encounter when your in argument.

 Go Visual

One way to learn something is to get a visual grasp of a lesson. So here are some visuals that will aid you to easily digest logic and it’s fallacies.

Check this infographic – You can view this awesome infographic in two ways, the poster version and the 11 x 17 jpeg,  thanks to The Visual Communicator Guy.

Download this free poster – Critical Thinking Shop offers this 24 x 36″ wall poster of the 24 most common fallacies for free in PDF format (just scroll bellow to see the download link).  Once you download it you can post it on your room or frame it so that you can see and remind you about logical fallacies.

 Listen to a Sunday School message

There are lots of audio resources that can be included in this section but let us stick to something simple. With a quick search on SermonAudio, I pick two of the best message on logical fallacy:

Josh Bales – Simply titled Fallacies, Bales delivered this message at The Wells Church. The audio is not that good but the content of it is solid. Most logical fallacies discussed has Bible references that you can check it yourself.

Jonathan Harris – Part of an apologetics series (which you can check it also), Logical Fallacies is based on the book The Fallacy Detectives. Again the audio is not good but it has a good run down of the fallacies and it has a PDF text that you can download.

 Take a Test

Choose below to see how you measure up on what you have learned so far. This will help you retain what you have learned from #2 and #3. Also this will prepare you for the last two ways which requires some heavy lifting.

Logical Fallacies Quiz – Posted on ProProfs, this free quiz has 6 easy questions that warm ups for the other quizzes below. To take this quiz, simply click the “Start” button.

Fun TriviaCan You Spot the Fallacy? has 10 questions and you need to read the arguments carefully.

The Fallacy Detective – Check this article How Logical Are You?  for a simple quiz on logical fallacies. Also check this free  witty official test  which includes some bonus stuff aside from the logical fallacy test. Answers are provided at the end of the test.

So by now you already have a grasp on logic and logical fallacies. Now let’s shift our gears on how your learning fit as an apologetics tool, thus this is the aim of this listacle. These last two ways will show you how.

Watch this Video

Dr. Jason Lisle had a tremendous impact to me in apologetics. His books really helped me see presuppositional apologetics power in subduing secular worldviews. Purchase his book Ultimate Proof of Creation and Discerning Truth and you’ll see what I mean. But since this is a budget free post on logic, check out this video from him. In this video you’ll see how, logic and apologetics fit hand in glove in dismantling arguments against Christianity solely based in his book Discerning Truth (a book on logical fallacies). This video is more leaning to the evolution vs. creation debate nevertheless it has a great presentation on logic and logical fallacies. Click to this link to another video that is based on Ultimate Proof of Creation which introduced me to presuppositional apologetics.


Download this book


Crossway Books and Vern Poythress are so generous to have Logic online and for free download. It’s a long book but given the caliber of the author, this is a must read. This will somewhat complement what you have learned from Dr. Lisle’s videos above.

Now that you have learn logic and logical fallacies, think of the arguments that you commonly encounter. Do you find it valid or invalid?

The Quotable Round-Up # 79

tpn6bjcHello guys! I hope you’re having a great day as you dive in this brand new collection of quotes! This time we are featuring fresh quotes from R. C. Sproul’s “The Consequence of Ideas” . And if you got stoked with these quotes, please get the book at your nearest Christian bookstore or on Amazon.

“Philosophy was born in the ancient quest for ultimate reality, the reality that transcends the proximate and commonplace and that defines and explains the data of everyday experience.”

“For Heraclitus the process of change is not chaotic but is orchestrated by “God.” I put God in quotes because for Heraclitus “God” is not a personal being but more like an impersonal force. Flux is the product of a universal reason Heraclitus calls the logos. Here we see the philosophical roots of the logos concept that the apostle John appropriated to define the preexistent and eternal person of the Godhead who became incarnate. It would be a serious mistake, however, simply to equate or identify John’s use of logos with that of Greek philosophy, because John filled the term with Hebrew categories of thought. At the same time it would be an equally serious mistake to separate completely John’s use of the term from Greek thought.”

“The true philosopher cannot be satisfied with empirical or sensory knowledge, which is not ideal knowledge but the shadowy knowledge of opinion—the “knowledge” of the cave. The true philosopher reaches for the essence of things, for the ideals. This allows the philosopher to rise above the superficiality of Sophism and the skepticism of the materialists. He seeks the universal and is dissatisfied with a list of particulars. After discerning that a particular object is beautiful or virtuous, he moves beyond that particular to discover the very essence of beauty and virtue.”

“As an organon, logic is the supreme tool necessary for all other sciences. It is the necessary condition for science even to be possible. This is because logic is essential to intelligible discourse. That which is illogical is unintelligible; it is not only not understood, but is also incapable of being understood. That which is illogical represents chaos, not cosmos. And absolute chaos cannot be known in an orderly way, making knowledge or scientia a manifest impossibility.”

“Aristotle understood that, to escape the illogical morass of infinite regress, the ultimate cause of motion must be an uncaused cause or an unmoved mover. Actuality must precede potentiality, just as being must precede becoming. Therefore being precedes becoming by logical necessity. This forms the classical root for the notion that “God” is a logically necessary being, an ens necessarium. Later philosophical theology would add that God is necessary not only logically but also ontologically. That is, pure being has its power of being within itself. It is self-existent and cannot not be.”
“The concept of divine revelation was central to Augustine’s epistemology, or theory of knowledge. He saw that revelation is the necessary condition for all knowledge. As Plato argued that to escape the shadows on the cave wall the prisoner must see things in the light of day, so Augustine argued that the light of divine revelation is necessary for knowledge.”

“Faith, says Augustine, is an essential ingredient of knowledge. Augustine does not restrict his notion of faith to what we typically refer to as religious faith. Faith also involves a provisional belief in things before we can validate them through demonstration. He adopted the famous motto Credo ut intelligam, “I believe in order to understand.”