A Quote by Alfred Tarski

Logic is justly considered the basis of all other sciences, even if only for the reason that in every argument we employ concepts taken from the field of logic, and that ever correct inference proceeds in accordance with its laws.
Through logic and inference we can prove anything. Therefore, logic and inference, in contrast to ordinary daily living experience, are secondary instruments of knowledge. Probably tertiary.
First, in your sermons, use your logic, and then your rhetoric; Rhetoric without logic, is like a tree with leaves and blossoms, but no root; yet more are taken with rhetoric than logic, because they are caught with fine expressions when they understand not reason.
The want of logic annoys. Too much logic bores. Life eludes logic, and everything that logic alone constructs remains artificial and forced.
I hope you become comfortable with the use of logic without being deceived into concluding that logic will inevitably lead you to the correct conclusion.
This battle for 'common-sense' gun control laws pits emotion and passion against logic and reason. All too often in such a contest, logic loses. So, expect more meaningless, if not harmful, 'gun control' legislation. Good news - if you're a crook.
Logic is a wonderful invention. It is so wonderful, people often mistake it for reason. Reason, however, requires sense. Logic requires only consistency.
...mathematics is distinguished from all other sciences except only ethics, in standing in no need of ethics. Every other science, even logic, especially in its early stages, is in danger of evaporating into airy nothingness, degenerating, as the Germans say, into an arachnoid film, spun from the stuff that dreams are made of. There is no such danger for pure mathematics; for that is precisely what mathematics ought to be.
If one doesn't value logic, what logical argument would you invoke to prove they should value logic?
I enjoy logic and logic puzzles. And filmmaking is one fun logic puzzle that you gotta win.
Logic is invincible, because in order to combat logic it is necessary to use logic.
Grammar is the logic of speech, even as logic is the grammar of reason.
Logic is not only an exact science, but is the most simple and elementary of all sciences; it ought therefore undoubtedly to find some place in every course of education.
The time must come inevitably when mankind shall surmount the imbecility of religion, as it has surmounted the imbecility of religion's ally, magic. It is impossible to imagine this world being really civilized so long as so much nonsense survives. In even its highest forms religion embraces concepts that run counter to all common sense. It can be defended only by making assumptions and adopting rules of logic that are never heard of in any other field of human thinking.
All traditional logic habitually assumes that precise symbols are being employed. It is therefore not applicable to this terrestial life but only to an imagined celestial existence... logic takes us nearer to heaven than other studies.
Prejudices are rarely overcome by argument; not being founded in reason they cannot be destroyed by logic.
Even though most people who reject Christianity treat it as a refuge for enemies of reason, the truth is that there may be no worldview in the history of the human race that has a higher regard for the laws of logic.
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