In this world nothing can be said to be certain, except death and taxes.
Wealth is not his that has it, but his that enjoys it.
All highly competent people continually search for ways to keep learning, growing, and improving. They do that by asking WHY. After all, the person who knows HOW will always have a job, but the person who knows WHY will always be the boss.
There will be sleeping enough in the grave.
Hear no ill of a friend, nor speak any of an enemy.
Many foxes grow gray but few grow good.