I can, therefore I am.
If you can dream it, you can do it.
Go for it now. The future is promised to no one.
Things do not happen. Things are made to happen.
Without hard work, nothing grows but weeds.
If you think you can do it, you can.
Expect problems and eat them for breakfast.
Always desire to learn something useful.
Problems are not stop signs, they are guidelines.
Leap, and the net will appear.
One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.