"Men have their virtues and their vices, their heroisms and their perversities; men are neither wholly good nor wholly bad, but possess and practice all that there is of good and bad here below. Such is the general rule. Temperament, education, the accidents of life, are modifying factors. Outside of this, everything is ordered arrangement, everything is chance. Such has been my rule of expectation and it has usually brought me success."

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As mineralogy constitutes a part of chemistry, it is clear that this arrangement [of minerals] must derive its principles from chemistry. The most perfect mode of arrangement would certainly be to allow bodies to follow each other according to the order of their electro-chemical properties, from the most electro-negative, oxygen, to the most electro-positive, potassium; and to place every compound body according to its most electro-positive ingredient.

— Jons Jacob Berzelius