In deed! Repentance involves a change of actions as well as regrets for wrong doing.
Repentance is such a bloodless, weak word in English. My Greek has long flown, but the word rendered as "Repentance" in the New Testament means roughly "to agree". If we say that we repent of a sin, we say that we agree with God about it, i.e. we hate it and renounce it. If we then return to the sin, what does that say about our agreement? Could it be that we were just admitting that we sinned, with no real agreement that our deeds were wrong or intention of turning away from them? Could we, in fact, feel justified in our sin? This is not to say that God will not forgive us again and again if confess the same sins. But when we see intractable sin habits in our own lives, or in the lives of others, we have every reason to be concerned about the sincerity of repentance.