The brickwalls are there to let us prove how badly we want something

Randy Pausch's last lecture .

Lessons I learned:
1) If you think somebody is bad, you just haven't give him enough time. Give them enough time and they will impress you.
2) The brickwalls are there to let us prove how badly we want something.
3) If you lead your life the right way, the car will take care of itself, the dreams will come at you.

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You can also find the entire lecture .