Evolution pays and that is why there is evolution
Is any knowledge worthless? Try to think of an example.
Doubt is the beginning, not the end, of wisdom.
When a learner, in the fullness of his powers, comes to great truths unstaled by premature familiarity, he rejoices in the lateness of his lessons.
Educated folk keep to one another's company too much, leaving other people much like milk skimmed of its cream.
Dumbness and silence are two different things.