We don't know that we often take the converse of a proposition, apply syllogisms, or reason using genus and species. He says that just as we are all to some extent athletes we are also to some extent logicians. My focus here is using modern, formal, and symbolic logic in a simple and practical way, rather than being concerned with the philosophical issues. Using Logic Logic can be a useful tool - when combined with normal human creativity. It is a means to avoid making mistakes.
Symbols give a short-hand notation and so a key to faster thinking.
I have used symbolic logic for note taking for many years. Unlike testing logic permits a systematic search for errors can end up showing that a piece of software has no bugs. Unlike creativity, logic can be taught. I've done this. Traditional symbolic logic is designed to fit in to a world with few assumptions but many deep theorems.