You can kick the football when it is difficult to do; but when it seems easy are you not sure to miss it? - Yoshida Kenkô (1283? - 1352?): Tsure-zure Gusa Section 109
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鞠もかたき所を蹴出してのち、やすくおもへば必ず落つと侍るやらん。 - 吉田兼好 (1283? - 1352?): 『徒然草』第百九段