Is the repentance of one who returns to the sin valid?

Question:
May Allah reward you. Your Eminence, the father, the questioner says: I committed a sin, and it is one of the major sins, then I repented to Allah, then I returned to it, then I committed it again. Is my repentance valid and accepted?

Answer:
You must resolve to repent and not return to it. But if your desires and the lust of your soul overcome you, do not despair of the mercy of Allah. Repent to Allah a second time. Repent and resolve. And if Satan and your soul overcome you, do not despair of the mercy of Allah and give up repenting, saying, "That is it, I have repented so many times, or not?" No, do not despair of the mercy of Allah. So repent to Allah, but a valid repentance is not one with the tongue only.
Yes. And leave the causes. A person may repent, but he does not leave the causes that lead him to the sin.
So he should stay away from the causes that led him to the sin in order to be safe from them. Bad companions, looking at channels or on satellite television or on the internet. This causes you to return to the disobedience. Stay away from the causes of disobedience along with the repentance.