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

The easiest person to deceive is yourself.

The wise person knows that no answer is also an answer

Knowledge is of no value unless you put it into practice.

Instead of finding reasons why you can't, find reasons why you can.

You're not in competition with anyone but yourself. Outdo your past, not other people.

We learn more from failure than we do from success.

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.

Tomorrow is worth more than yesterday but less than today.

Hard work always pays off - it is not a question of if you will get there, but WHEN you will get there

Work ethic is important, because, unlike intelligence, athleticism, or charisma, or any natural attribute, it’s a choice.

If you want to succeed, double your failure rate.

You can hire a tutor but you can't hire someone to practice for you.

Mathematics Is not a spectator sport. The only way to learn mathematics is to do mathematics.

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