"A chord, stronger or weaker, is snapped asunder in every parting, and time's busy fingers are not practiced in re-splicing broken ties. Meet again you may; will it be in the same way? With the same sympathies? With the same sentiments? Will the souls, hurrying on in diverse paths, unite once more, as if the interval had been a dream? Rarely, rarely!"

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Gradually, at various points in our childhoods, we discover different forms of conviction. There's the rock-hard certainty of personal experience ("I put my finger in the fire and it hurt,"), which is probably the earliest kind we learn. Then there's the logically convincing, which we probably come to first through maths, in the context of Pythagoras's theorem or something similar, and which, if we first encounter it at exactly the right moment, bursts on our minds like sunrise with the whole universe playing a great chord of C Major.

— Philip Pullman