Empty purse into head...

"If a man empty his purse into his head, no man can take it away from him. An investment in knowledge always pays the best dividends."

Benjamin Franklin

Convenience of speech...

"Speech is conveniently located midway between thought and action, where it often substitutes for both."

John Andrew Holmes

Simply tell the truth...

"You'll never get mixed up if you simply tell the truth. Then you don't have to remember what you have said, and you never forget what you have said."

Sam Rayburn