All correct reasoning is a grand system of tautologies, but only God can make direct use of that fact
Propositions show what they say: tautologies and contradictions show that they say nothing.
Once the last trace of emotion has been eradicated, nothing remains of thought but absolute tautology.
Reason is simply a vast tautology.
Being both entrepreneurial and social is no longer an oxymoron, but rather a tautology.
All mathematics is tautology.
My mother was Irish and she was superstitious, if you'll forgive the tautology.