I would not enter on my list of friends,
(Though graced with polish'd manners and fine sense,
Yet wanting sensibility) the man
Who needlessly sets foot upon a worm.
An inadvertent step may crush the snail
That crawls at evening in the public path;
But he that has humanity, forewarn'd,
Will tread aside, and let the reptile live.

Line 560. - The Task (1785) - Book VI, Winter Walk at Noon