Be gentle to all and stern with yourself.
What you do today can improve all your tomorrows.
It's always too early to quit.
If you're going through hell, keep going.
Expect problems and eat them for breakfast.
Problems are not stop signs, they are guidelines.
Begin to be now what you will be hereafter.
The dog that trots about finds a bone.
Wherever you are - be all there.
To know oneself, one should assert oneself.
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.