It isn't work that makes you tired, it's your mental attitude.
Be a good listener. Encourage others to talk about themselves.
Do the very best you can.
Pay less attention to what men say. Just watch what they do.
Naturalness is the easiest thing in the world to acquire, if you will forget yourself-forget about the impression you are trying to make.
If you do the little jobs well, the big ones will tend to take care of themselves.