The only use of an obstacle is to be overcome. All that an obstacle does with brave men is, not to frighten them, but to challenge them.
If a dog will not come to you after having looked you in the face, you should go home and examine your conscience.
You are not here merely to make a living. You are here in order to enable the world to live more amply, with greater vision, with a finer spirit of hope and achievement. You are here to enrich the world, and you impoverish yourself if you forget the errand.