Tough times never last, but tough people do.

Procrastination makes easy things hard and hard things harder.

We learn more from failure than we do from success.

The master has failed more times than the beginner has even tried

It is never too late to turn an unproductive day into a productive one.

Good mathematics is not about how many answers you know... It is about how you behave when you don't know.

Skills are built not born.

Nothing is impossible if you want it badly enough. Impossible = I'm possible.

Pure mathematics is in its way, the poetry of logical ideas.

I can is 100 times more important than IQ.

Success is a journey, not a destination.

Success is not final, failure is not fatal.  It is the courage to continue that counts.

I had no time is no excuse. 1 hour is 4% of your day and 1 minute is 0.34 % of your day.

I have not failed, I've just found 10,000 ways that won't work.

You cannot start the next chapter of your life if you keep re-reading the last one.