The fountain of content must spring up in the mind, and he who has so little knowledge of human nature as to seek happiness by changing anything but his own disposition will waste his life in fruitless efforts, and multiply the griefs which he purposes to remove.
The further the spiritual evolution of mankind advances, the more certain it seems to me that the path to genuine religiosity does not lie through the fear of life, and the fear of death, and blind faith, but through striving after rational knowledge.
The future of humanity is uncertain, even in the most prosperous countries, and the quality of life deteriorates; and yet I believe that what is being discovered about the infinitely large and infinitely small is sufficient to absolve this end of the century and millennium. What a very few are acquiring in knowledge of the physical world will perhaps cause this period not to be judged as a pure return of barbarism.
The great difference between those who succeed and those who fail does not consist in the amount of work done by each but in the amount of intelligent work. Many of those who fail most ignominiously do enough to achieve grand success but they labor haphazardly at whatever they are assigned, building up with one hand to tear down with the other. They do not grasp circumstances and change them into opportunities. They have no faculty for turning honest defeats into telling victories. With ability enough and ample time, the major ingredients of success, they are forever throwing back and forth an empty shuttle and the real web of their life is never woven.