Mbh 12.180.2b

There is no acquisition that is more valuable than the acquisition of hands. Behold, O Brahmana, I cannot extract this thorn that has entered my body, or crush these insects and worms that are biting and afflicting me greatly! They that have bestowed upon them two hands with ten fingers, succeed in throwing away or crushing the worms (by scratching) that bite their limbs. They succeed in constructing shelters for themselves from rain, cold, and heat. They succeed also in enjoying excellent clothes for themselves, good food, comfortable beds, and excellent habitations. Lying on this Earth, they that have hands enjoy kine and other animals and cause them to carry burthens or drag their vehicles, and by the aid of diverse means bring those animals under sway (for their own purposes). Those living creatures that are without tongues, that are helpless, of little strength, and destitute of hands, bear all the several kinds of misery (indicated above). By good luck, O ascetic, thou art not like them. By good luck, thou art not a jackal, nor a worm, nor a mouse, nor a frog, nor an animal of any other miserable order. With this measure of gain (that thou hast won), thou shouldst, O Kasyapa, be contented! How happy, again, shouldst thou feel at the thought that amongst living creatures thou art a superior Brahmana! These worms are biting me! For want of hands I am unable to drive them off. Behold this my miserable plight! I do not cast off life because to do so is a very sinful act, and lest, indeed, I fall into a more miserable order of existence! This order of existence, viz., that of a jackal, to which I now belong is rather tolerable. Miserable as it is, there are many orders of existence below it that are more miserable still. By birth certain classes of creatures become happier than others who become subject to great woe. But I never see that there is any order of being which can be said to be in the possession of perfect happiness.