«The mind never need stop growing. Indeed, one of the few experiences which never pall is the experience of watching one's own mind and how it produces new interests, responds to new stimuli, and develops new thoughts, apparently without effort and almost independently of one's own conscious control.»

«What is difficulty? Only a word indicating the degree of strength requisite for accomplishing particular objects; a mere notice of the necessity for exertion; a bugbear to children and fools; only a stimulus to men»

«The happiness which brings enduring worth to life is not the superficial happiness that is dependent on circumstances. It is the happiness and contentment that fills the soul even in the midst of the most distressing circumstances and the most bitter environment. It is the kind of happiness that grins when things go wrong and smiles through the tears. The happiness for which our souls ache is one undisturbed by success or failure, one which will root deeply inside us and give inward relaxation, peace, and contentment, no matter what the surface problems may be. That kind of happiness stands in need of no outward stimulus.»