Knowing trees, I understand the meaning of patience. Knowing grass, I can appreciate persistence.

The game isn't over till it's over.

Persistence is the hard work that you do after you are tired of doing the hard work you already did.

It is no good getting furious if you get stuck. What I do is keep thinking about the problem but work on something else. Sometimes it is years before I see the way forward. In the case of information loss and black holes, it was twenty-nine years.

My mum used to say to me, 'Spit on yer 'ands and take a fresh 'old.' Keep going even if you have setbacks.

The question isn't who's going to let me; it's who's going to stop me.

Persistent people begin their success where others end in failure.