Without inspiration the best powers of the mind remain dormant. There is a fuel in us which needs to be ignited with sparks.
Johann Gottfried Von Herder

The only way of finding the limits of the possible is by going beyond them into the impossible.
Arthur C. Clarke

If you do not hope, you will not find what is beyond your hopes.
St. Clement of Alexandra

It was a high counsel that I once heard given to a young person, "Always do what you are afraid to do."