Open your mind before your mouth
Let each man exercise the art he knows.
Words give wings to the mind and make a man soar to heaven.
Open your mouth and shut your eyes and see what Zeus will send you.
Youth ages, immaturity is outgrown, ignorance can be educated, and drunkenness sobered, but stupid lasts forever.
If you strike upon a thought that baffles you, break off from that entanglement and try another, so shall your wits be fresh to start again.