It's always too early to quit.
Problems are not stop signs, they are guidelines.
Know or listen to those who know.
Be gentle to all and stern with yourself.
Be kind whenever possible. It is always possible.
Wherever you are - be all there.
Begin to be now what you will be hereafter.
What you do today can improve all your tomorrows.
To be a good loser is to learn how to win.
Be thine own palace, or the world's thy jail.
Soon I knew the craft of experimental physics was beyond me - it was the sublime quality of patience - patience in accumulating data, patience with recalcitrant equipment - which I sadly lacked.