Envy not the old man the tranquillity of his existence, nor yet blame him if it sometimes looks like apathy. Time, the inexorable, does not threaten him with the scythe so often as with the sand-bag. He does not cut, but he stuns and stupefies. One's fellow-mortals can afford to be as considerate and tender with him as Time and Nature.
 Oliver Wendell Holmes Sr., Over the Teacups (1891). copy citation

Context

“A little breath of wind brings down the raindrops which have gathered on the leaves of the tremulous poplars. A very slight suggestion brings the tears from Marlborough's eyes, but they are soon over, and he is smiling again as an allusion carries him back to the days of Blenheim and Malplaquet. Envy not the old man the tranquillity of his existence, nor yet blame him if it sometimes looks like apathy. Time, the inexorable, does not threaten him with the scythe so often as with the sand-bag. He does not cut, but he stuns and stupefies. One's fellow-mortals can afford to be as considerate and tender with him as Time and Nature. There was not much boasting among us of our present or our past, as we sat together in the little room at the great hotel. A certain amount of self-deception is quite possible at threescore years and ten, but at three score years and twenty Nature has shown most of those who live to that age that she is earnest, and means to dismantle and have done with them in a very little while.” source