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

The greatest glory in loving lies not in never falling, but in rising every time we fall.

Success is a journey, not a destination.

There are no shortcuts to any place worth going.

Practice makes comfort. Expand your experiences regularly so every stretch won't feel like your first.

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

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

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

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

Procrastination makes easy things hard and hard things harder.

It doesn’t matter where you start, it matters how you end

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

I had no time is no excuse. 1 hour is 4% of your day and 1 minute is 0.34 % of your day.

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

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