It's always too early to quit.
Always desire to learn something useful.
Wherever you are - be all there.
If you think you can do it, you can.
Expect problems and eat them for breakfast.
Be gentle to all and stern with yourself.
Be kind whenever possible. It is always possible.
Things do not happen. Things are made to happen.
If you've got a talent, protect it.
I can, therefore I am.
Though I had success in my research both when I was mad and when I was not, eventually I felt that my work would be better respected if I thought and acted like a 'normal' person.