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Reason is applied to what is developing, practical understanding to what is developed. The former does not ask, What is the Purpose? and the latter does not ask, What is the source? Reason takes pleasure in development; practical understanding tries to hold things fast so that it can use them.
All the entertainment and talk of history is nothing almost but fighting and killing: and the honour and renown that is bestowed on conquerers (who for the most part are but the great butchers of mankind) farther mislead growing youth, who by this means come to think slaughter the laudible business of mankind, and the most heroick of virtues. By these steps unnatural cruelty is planted in us; and what humanity abhors, custom reconciles and recommends to us, by laying it in the way to honour. Thus, by fashioning and opinion, that comes to be a pleasure, which in itself neither is, nor can be any.
If you saw the first painted color studies that I made when I came here to Nuenen  — and the present canvas  — side by side — I think you'd see that as far as color is concerned — things have livened up. I think that the question of the breaking of colors in the relationships of the colors will occupy you too one day. For as an art expert and critic, one must also, it seems to me — be sure of one's ground and have certain convictions. At least for one's own pleasure and to be able to give reasons, and at the same time one must be able to explain it in a few words to others, who sometimes turn to someone like you for enlightenment when they want to know something more about art.
Every excess causes a defect; every defect an excess. Every sweet hath its sour; every evil its good. Every faculty which is a receiver of pleasure has an equal penalty put on its abuse. It is to answer for its moderation with its life. For every grain of wit there is a grain of folly. For every thing you have missed, you have gained something else; and for every thing you gain, you lose something. If riches increase, they are increased that use them. If the gatherer gathers too much, nature takes out of the man what she puts into his chest; swells the estate, but kills the owner. Nature hates monopolies and exceptions.