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There are mountainous, arduous days, up which one takes an infinite time to climb, and downward-sloping days which one can descend at full tilt, singing as one goes.

Marcel Proust (2015). “Swann's Way”, p.424, Vintage
There are mountainous, arduous days, up which one takes an infinite time to climb, and downward-sloping days which one can descend at full tilt, singing as one goes.