Perseverance is a silent power that grows irresistibly greater with time.
Johann Wolfgang von GoetheThere is no permanence in doubt; it incites the mind to closer inquiry and experiment, from which, if rightly managed, certainty proceeds, and in this alone can man find thorough satisfaction.
Johann Wolfgang von GoetheThere are people who pay attention to the weaknesses of their friends; that is to no avail. I have always closely watched and profited from the strengths of my adversaries.
Johann Wolfgang von Goethe