From The Sadness of Christ:
Here telleth the evangelist that Judas stood also with them. For when he heard Christ so plainly
lay his treason unto him, either for shame or for fear (for he wist well enough how fierce of nature Peter
was) he drew back by and by, and retired to his company again. And why does the evangelist make
mention of Judas’s standing amongst them, but to make us understand that he likewise fell down with
them? And surely such a wretch was Judas that in all the company there was not a worse, nor a more
worthy to have a fall.
But hereby meant the evangelist to give every man a general warning to take good heed what
company he keepeth, for fear if he match himself with evil folk, with them may he fortune to fall. Since
seldom chanceth it that whoso like a fool placeth himself in a leaking ship with such as after by
misfortune be cast into the sea, doth escape alive to land, and all the rest be drowned.
Saint Thomas perhaps was thinking of the vast majority of his friends and associates who betrayed Christ in order to keep favor with the King