Be thine own palace, or the world's thy jail.
The wise does at once what the fool does at last.
It's always too early to quit.
If you think you can do it, you can.
You never know what motivates you.
Things do not happen. Things are made to happen.
Well done is better than well said.
Begin to be now what you will be hereafter.
Either you run the day or the day runs you.
The secret of getting ahead is getting started.
A serious and good philosophical work could be written consisting entirely of jokes.