The greatest thing in life is to keep your mind young.
Thinking is the hardest work there is, which is probably the reason why so few engage in it.
Those who believe they can do something and those who believe they can't are both right.
Many people miss opportunity because it came disguised in overalls.
There are three things that grow more precious with age; old wood to burn, old books to read, and old friends to enjoy.
Anyone who keeps learning stays young.