The 'mātrās' are the senses, hearing and the rest, by which sounds and other things are measured (mīyante). Their contacts, the joinings with sound and the rest, give cold, heat, pleasure and pain. Or else the 'sparśas' are the objects, sound and the rest, that are touched; both the senses and the objects give cold, heat, pleasure and pain. Cold is sometimes pleasant, sometimes painful, and heat too is of no fixed nature; pleasure and pain, however, are of fixed nature, since they do not vary, and so are mentioned apart from cold and heat. Since these contacts of the senses come and go, they are impermanent; therefore endure them, bear with them, and feel neither joy nor dejection in them. That is the meaning. Hear what comes to one who endures cold, heat and the rest.
Contemporary English rendering of the Sanskrit bhāṣya, pending scholar review.