It's always good to be underestimated.

Never underestimate the power of dreams and the influence of the human spirit. We are all the same in this notion: The potential for greatness lives within each of us.

A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.

I say this as a young dad seeing children going into primary school: I don't think we should underestimate the formative effect on a child of those first years in primary school.

You may not always have a comfortable life and you will not always be able to solve all of the world's problems at once but don't ever underestimate the importance you can have because history has shown us that courage can be contagious and hope can take on a life of its own.

We always overestimate the change that will occur in the next two years and underestimate the change that will occur in the next ten. Don't let yourself be lulled into inaction.