Security is mostly a superstition. It does not exist in nature.

He who is content with what has been done is an obstacle in the path of progress.

The most beautiful world is always entered through imagination.

The joy of surmounting obstacles which once seemed unremovable, and pushing the frontier of accomplishment further — what joy is there like unto it?

Everything has its wonders, even darkness and silence, and I learn, whatever state I may be in, therein to be content.

Happiness calls out responsive gladness in others. There is enough sadness in the world without yours ... never doubt the excellence and permanence of what is yet to be. Join the great company of those who make the barren places of life fruitful with kindness.

Self-pity is our worst enemy and if we yield to it, we can never do anything wise in this world.