When the apple is ripe it will fall. – Proverb

We have not passed that subtle line between childhood and adulthood until we move from the passive voice to the active voice – that is, until we have stopped saying It got lost, and say, I lost it. – Sydney J. Harris

By the age of twenty, any young man should know whether or not he is to be a specialist and just where his tastes lie. By postponing the question we have set on immaturity a premium which controls most American personality to its deathbed. – Robert S. Hillyer