一寸の光陰軽んずべからず

いっすんのこういんかろんずべからず

expression

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there isn't a moment to be wasted, every moment is precious, make hay while the sun shines(proverb)

一	one, one radical (no.1)
寸	measurement, tenth of a shaku, a little, small
光	ray, light
陰	shade, yin, negative, sex organs, secret, shadow
軽	lightly, trifling, unimportant
可	can, passable, mustn't, should not, do not