Be kind whenever possible. It is always possible.
Well done is better than well said.
The wise does at once what the fool does at last.
The most effective way to do it, is to do it.
Either you run the day or the day runs you.
To know oneself, one should assert oneself.
Do not weep do not wax indignant. Understand.
The dog that trots about finds a bone.
Be thine own palace, or the world's thy jail.
Be gentle to all and stern with yourself.
I'm someone who's done the opposite of whatever the received wisdom is, to keep your career going into your 50s.