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

The wise person knows that no answer is also an answer

Nobody said it’d be easy, they just promised it would be worth it.

We all have two lives. The second begins when we realise we only have one. 

I can is 100 times more important than IQ.

The greatest mistake we make is living in constant fear that we will make one.

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

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

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

If you can understand just one thing thoroughly, then you will understand everything.

You can have results or excuses, not both

There is no talent here. There is hard work and obsession. You could be anyone if you put in the time.

Don't fear failure, fear being in the same exact same place next year as you are now.

Just stick with it, what seems hard now will one day be your warm up.

He who has begun his task is half-way done. Have the courage to begin!