He wrote Fronto a letter on his birthday, claiming to love him as he loved himself, and calling on the gods to ensure that every word he learnt of literature, he would learn 'from the lips of Fronto'. His prayers for Fronto's health were more than conventional, because Fronto was frequently ill; at times, he seems to be an almost constant invalid, always suffering – about one-quarter of the surviving letters deal with the man's sicknesses. Marcus asks that Fronto's pain be inflicted on himself, 'of my own accord with every kind of discomfort'.