Herbert Spencer

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If a single cell, under appropriate conditions, becomes a man in the space of a few years, there can surely be no difficulty in understanding how, under appropriate conditions, a cell may, in the course of untold millions of years, give origin to the human race

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We too often forget that not only is there 'a soul of goodness in things evil,' but very generally also, a soul of truth in things erroneous

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They who employ force by proxy are as much responsible for that force as though they employed it themselves

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No man is equal to his book. All the best products of his mental activity go into his book, where they come separated from the mass of inferior products with which they are mingled in his daily talk

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Evolution is an integration of matter and concomitant dissipation of motion during which the matter passes from an indefinite incoherent homogeneity to a definite coherent heterogeneity, and during which the retained motion undergoes a parallel transformation