„I know that I have the ability to achieve the object of my Definite Purpose in life, therefore, I DEMAND of myself persistent, continuous action toward its attainment, and I here and now promise to render such action.“

— Napoleon Hill

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„Maybe that is the best lesson I learned in my first semester at Yale, because if I had gone to a less-demanding school and continued to sail along on the top, I am sure I would never have attained the subsequent achievements in my life.“
— Ben Carson
„The wisest and the best of men, nay, the wisest and best of their actions, may be rendered ridiculous by a person whose first object in life is a joke.“
— Jane Austen
„My mother is my root, my foundation. She planted the seed that I base my life on, and that is the belief that the ability to achieve starts in your mind.“
— Michael Jordan
„I believe that I have cosmic religious feelings. I never could grasp how one could satisfy these feelings by praying to limited objects. The tree outside is life, a statue is dead. The whole of nature is life, and life, as I observe it, rejects a God resembling man. I like to experience the universe as one harmonious whole. Every cell has life. Matter, too, has life; it is energy solidified. Our bodies are like prisons, and I look forward to be free, but I don't speculate on what will happen to me. I live here now, and my responsibility is in this world now.... I deal with natural laws. This is my work here on earth.“
— Albert Einstein
„Once I knew the depth where no hope was, and darkness lay on the face of all things. Then love came and set my soul free. Once I knew only darkness and stillness. Now I know hope and joy. Once I fretted and beat myself against the wall that shut me in. Now I rejoice in the consciousness that I can think, act and attain heaven. My life was without past or future; death, the pessimist would say, "a consummation devoutly to be wished."“
— Helen Keller
„To study the meaning of man and of life — I am making significant progress here. I have faith in myself.“
— Fyodor Dostoyevsky