Success can never happen without the journey (struggle).

Tough times never last, but tough people do.

I think, therefore I am.

The temptation to quit will be the greatest when you are about to succeed

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

Don't put off until tomorrow what you can do today. If today you have no time, it means tomorrow you'll be too tired and the next day you'll be something else.

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

Don't be afraid to take an unfamiliar path.  Sometimes they're the ones that lead you to the best places.

Work on your weaknesses until they are your strengths and work on your strengths until they are second nature.

The road to success is like a staircase. If you want to succeed, double your failure rate

You'll never change your life until you change something you do daily. The secret to success and change in found in your daily routine.

We are all maths people : step 1 - do maths and step 2 - be a person. 

Hard work beats talent when talent doesn't work hard.

There are no bad mistakes in maths, only discoveries.

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