Originally Posted by Rotaerk

Deductive logic only deals in absolutes. "A implies B" means that B is certainly (absolutely) true when A is certainly true. Logic can tell you when something is absolutely true and absolutely false.

It's also possible to have statements which are somewhere in between absolutely true and absolutely false. These are statements like "There is a 70% chance that it will rain tonight." This is the realm of inductive logic. It is built on top of deductive logic, but takes uncertainty into account.

It's also possible to have truths which are absolutely uncertain, i.e. precisely 50/50% chance of being true. "God exists", for instance, is uncertain to me because I have nothing which even shifts the probability of, much less derives the absolute truth of, the statement.