Genesis 32:31

31.And he halted upon his thigh. It is probable, and it may be gathered even from the words of Moses, that this halting was without the sense of pain, in order that the miracle might be the more evident. For God, in the flesh of his servant, has exhibited a spectacle to all ages, from which the faithful may perceive that no one is such a powerful combatant as not to carry away some wound after a spiritual convict, for infirmity ever cleaves to all, that no one may be pleased with himself above measure. Whereas Moses relates that the Jews abstained from the shrunken sinew, or that part of the thigh in which it was placed: this was not done out of superstition. (111) For that age, as we know, was the infancy of the Church; wherefore the Lord retained the faithful, who then lived, under the teaching of the schoolmaster. And now, though, since the coming of Christ, our condition is more free; the memory of the fact ought to be retained among us, that God disciplined his people of old by external ceremonies.