In the 'Daily Bread' chapter of Parables from Nature, a Tortoise grumbles at a Robin for singing cheerfully on such a "cold and damp, bare tree" wintery day, when one should really be more glum or at least respectful of the glumness of one's neighbors. I absolutely love Robin's reply to Tortoise.
"I like warm sunny days the best, perhaps, " replied the Robin, "if I am obliged to think about it and make comparisons. But why should I do so? I am quite comfortable as it is. If there is not so much variety of food as there has been, there is, at any rate, enough for every day, and everybody knows that is as good as a feast. For my part, I don't see how I can help being contented."
About the book: Parables from Nature is a cheery book of nature-based parables written by Mrs. Alfred Gatty in 1855. I've read much of it to the children and much of it to myself, picking it up now and then, as each chapter is self-contained (meaning, you needn't start at the beginning and read through to the end of the book). You may read Parables from Nature for free here, or order it from Amazon, here. A note if you'd like to order a copy: Order the one published by Yesterday's Classics as others are not of high font quality, according to Amazon reviews. I have the one published by Yesterday's Classics. I purchased it, in fact, from the family themselves at a conference, and do think it's of excellent print quality, although not a hardback, which I'd prefer of my favorite books.