The true wisdom is to be always seasonable, and to change with a good grace in changing circumstances. To love playthings well as a child, to lead an adventurous and honourable youth, and to settle when the time arrives, into a green and smiling age, is to be a good artist in life and deserve well of yourself and your neighbour.

Robert Louis Stevenson (1850–1894) Scottish essayist, novelist, poet

Essay (1878-03), “Crabbed Age and Youth,” Cornhill Magazine, Vol. 38
    (Source)

Collected in Virginibus Puerisque and Other Papers, ch. 2 (1881)