it’s a little bit of both actually; words hold power. so, he does trust the words of an individual / person.
however, at the same time, words can be broken easily, and be must trust on the acts of a person / what they do to prove themselves.
the problem is, he would enjoy preferring to 100% trust just the words of someone, but as he’s learned in the past… you have to rely more on a person’s actions than words. since, while words do have power – they can create and become a symbol – they also are meaningless with out actions to back them up / support them.