To know oneself, one should assert oneself.
You never know what motivates you.
I can, therefore I am.
Be thine own palace, or the world's thy jail.
It's always too early to quit.
Problems are not stop signs, they are guidelines.
The wise does at once what the fool does at last.
Well done is better than well said.
Go for it now. The future is promised to no one.
Expect problems and eat them for breakfast.
The history of astronomy is a history of receding horizons.
Equipped with his five senses, man explores the universe around him and calls the adventure Science.