en_tn/2ti/02/11.md

this saying

"these words"

died

Here this means someone dying to himself. In other words, refusing to give into his own desires.

if we are unfaithful

"even if we fail God" or "even if we do not do what we believe God wants us to do"

he cannot deny himself

"he must always do act according to his character" or “he cannot act in ways that are opposite of his real character”