These children are constitutionally sad. Other children, like Luke, develop depressive feelings out of the blue or in response to some mild stressor.

A man straineth, liveth, then dieth.

other carnivorous Animals are difficultly nourished by Plants alone

To grunt and sweat under a weary load does perfectly well where it comes in Shakspeare: but if the translator of Homer, who will hardly have wound up our minds to the pitch at which these words of Hamlet find them, were to employ, when he has to speak of Homer's heroes under the load of calimity, this figure of 'grunting' and 'sweating' we should say, he Newmanizes, and his diction would offend us.