20 Cardinals and great lords often offered him hospitality but he abruptly refused all such invitations. Though he exhibited the greatest esteem for all men and rendered each man every possible deference, he looked upon himself as a sinner, considering himself as only one among many sinners. In fact, he believed himself the greatest of all sinners. He was accustomed to say that if the mercy shown him by God had been given to any other sinner, the latter would have become ten times holier than he, and that to God alone must be attributed whatever was found in him of goodness and beauty, for from God only was it derived. For this reason he tried in every possible way to hide those privileges and graces, especially the stigmata of Our Lord imprinted on his body, which might have gained for him the esteem and praise of men. When at times he was praised, either in public or in private, he not only refused to accept such praise but protested that he was worthy only of contempt and abuse and was really saddened thereby. Finally, what must we say about the fact that he thought so humbly of himself that he did not consider himself worthy to be ordained a priest?
Source: Rite Expiatis (Vatican.va)