Rev Hugh McMillan, Lessons from life (animal and human) a compendium of moral teachings Illustrated by curious and interesting habits , relations, instincts, peculiarities, and ministries of living creatures, Londres, Elliot Stock, 1897, p. 193.

The Caddis Worm. A wise man makes the best that he possibly can out of the circumstances in which he is placed. Men are continually groaning over their disabilities. We grow weary with hearing their complaints of their feeble bodies, their nervous irritability, their limited powers of mind, their hopeless circumstances (in) their many ennemies. Men are always grumbling, either at the forefathers, who gave them their dispositions, or at the Providence which arranges their circumstances. There is nothing noble in all this. Every man has his diabilities and his difficulties ; but the problem of life for every man is this –‘Given your particular disabilities, what are you going to make of your life in spite of them, and even by means of them ?’
The soft fleshy caddis-worm might reasonably do a great deal of complaining. Why was I made such a juicy and attractive morsel to the fishes ? Why was I left so entirely underfended ? What can any creature make of life under such condition as mine ? The following paragraph will show how bravely, and with what persistent labour, the caddis-worm meets her disabilities, and makes the best possible chances