From A Chinese Garden of Serenity (1959), by Hung Tzu-ch’eng, translated by Chao Tze-chiang:

When a man leisurely looks at the flies hurtling against a paper-screen, he may scornfully laugh at those idiots who make obstacles for themselves. When he quietly watches the jackdaws squabbling for a nest, he may sigh with regret for those eminent men who struggle with vain heroism.