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

There is great wisdom in being able to realise that you don’t understand something before it goes too far.

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

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

Go as far as you can see, when you get there, you’ll be able to see further

99% of failures come from people who have the habit of making excuses.

Hope might be a good breakfast, but it makes a very poor dinner

Don’t confuse your path with your destination. Just because its stormy now doesn’t mean you are headed for failure.

Time is your friend, impulse is your enemy.

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

You cannot escape the responsibility of tomorrow by evading it today

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

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

Success is the sum of small repeated efforts, day in and day out.

Yesterday is history, tomorrow is a mystery, but today is a gift—that's why it's called 'the present