Thomas Aquinas,
Summa Theologiae — Question 144 - OF SHAMEFACEDNESS…
“ I answer that, Since reproach is opposed to honor, just as honor denotes attestation to someone's excellence, especially the excellence which is according to virtue, so too reproach, the fear of which is shamefacedness, denotes attestation to a person's defect, especially that which results from sin. Hence the more weighty a person's attestation is considered to be, the more does he make another person ashamed. Now a person's attestation may be considered as being more weighty, either because he is certain of the truth or because of its effect. ”
