Never complain and never explain.
It's always too early to quit.
You never know what motivates you.
Leap, and the net will appear.
Be kind whenever possible. It is always possible.
The dog that trots about finds a bone.
The most effective way to do it, is to do it.
Be thine own palace, or the world's thy jail.
Always desire to learn something useful.
Begin to be now what you will be hereafter.
Science is a self-sufficient activity.
The thing about science is that it's an accurate picture of the world.