Nitishatak Shaloka-5

You may even succeed, by persistent endeavours, to obtain oil by compresing the particles of sand, or to find out water to drink in the midst of a mirage; for sometimes in your wanderings you may even come upon the horns of a hare; but the propitiation of the inpenetrable heart of a perverse fool is undoubtedly a useless undertaking for all your varied efforts.- Bhartrihari (Translation by Purohit Gopi Nath,M.A., 1914)