You never know what motivates you.
If you think you can do it, you can.
Never complain and never explain.
Always desire to learn something useful.
It's always too early to quit.
Know or listen to those who know.
Things do not happen. Things are made to happen.
The dog that trots about finds a bone.
Expect problems and eat them for breakfast.
Be gentle to all and stern with yourself.
As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications.
Whenever anyone says, 'theoretically,' they really mean, 'not really.'