Procrastination makes easy things hard and hard things harder.

Tomorrow is worth more than yesterday but less than today.

We learn more from failure than we do from success.

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

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

No matter how bad it gets, you’re still way ahead of those who haven’t even started.

The easiest person to deceive is yourself.

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

I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times.

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

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

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

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

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

The journey of a thousand miles begins with one step.