Theories are always very thin and insubstantial, experience only is tangible.
I have no useful theories about love and marriage.
It is a test of true theories not only to account for but to predict phenomena.
Theories pass. The frog remains.
I do not believe in conspiracy theories.
Theories that go counter to the facts of human nature are foredoomed.
People love conspiracy theories.
Goals and objectives are based on theories and foundations.
I know my theories and findings are hard for you to accept because they are so original and extraordinary.
Theories are patterns without value. What counts is action.