Perseverance is a silent power that grows irresistibly greater with time.
Johann Wolfgang von GoetheAll truly wise thoughts have been thought already thousands of times; but to make them truly ours, we must think them over again honestly, until they take root in our personal experience.
Johann Wolfgang von GoetheThe history of knowledge is a great fugue in which the voices of the nations one after the other emerge.
Johann Wolfgang von Goethe