"No Victor, you got it backwards, you should evaluate these integrals non-rigorously if you can, and rigorously if you must."

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A self is, by its very essence, a being with a past. One must look lengthwise backwards in the stream of time in order to see theself, or its shadow, now moving with the stream, now eddying in the currents from bank to bank of its channel, and now strenuously straining onwards in the pursuit of its chosen good.

— Josiah Royce