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