A ship in port is safe, but that's not what ships are built for.
The most dangerous phrase in business is 'We've always done it this way.'
Simple, sincere people seldom speak much of their piety; it shows itself in acts rather than words, and has more influence than homilies or protestations.
A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between proofs and the best mathematician can notice analogies between theories.