Repentance

The word Tawbah (Repentance) in Arabic literally means 'to return'. In an Islamic context, it refers to the act of leaving what Allaah has prohibited and returning to what He has commanded.
The subject of repentance is one which concerns all people who believe in God, and is vital one for the Muslims to understand because our salvation in the hereafter is dependent on our repentance to Allaah, as is shown by Allaah's order:
"AND TURN YOU ALL TOGETHER IN REPENTANCE TO ALLAAH O BELIEVERS, THAT YOU MAY BE SUCCESSFUL" [An-Noor (24):31]
"SURELY ALLAAH LOVES THOSE WHO TURN UNTO HIM IN REPENTANCE AND LOVES THOSE WHO PURIFY THEMSELVES." [2:222]
This shows how pleasing our repenting is to Allaah. Also, the Prophet, Sallallaahu 'alaihi wa sallam gave us an example of just how pleasing to Allaah our repenting is an authentic hadeeth in which he, (Sallalaahu Alaihi wa Sallam) said:
"Allaah is more delighted with the repentance of His servant than one of you would be, who suddenly finds his camel laden with supplies after losing it in a barren land" Then think that Allaah's delight is even greater than this when His slave repents to Him. So much so, that if man stopped repenting to Allaah, He would replace us with another creation that would turn to Him for forgiveness. The Prophet (Sallalaahu Alaihi wa Sallam) said:
"If you did not commit sins, Allaah would sweep you out of existence and replace you by another people who would commit sins, ask for Allaah's forgiveness and He would forgive them."
The problem with many of us today, is that we don't fear Allaah, which means that we don't think twice about disobeying Him and therefore falling into sin, which we give no real tought to. So perhaps we should think about the statement which Ibn Mas'ood ( radi Allaahu 'anhu, made: "A believer sees his sins as if he were sitting under a mountain which he is afraid may fall on him, whereas the wicked person considers his sins as flies passing over his nose and he just drives them away like this (and he moved his hand over his nose in illustration)."
NEVER DESPAIR
Someone might say, 'I want to repent but my sins are too many.' But Allaah says:
"SAY: O MY SLAVES WHO HAVE TRANSGRESSED AGAINST THEMSELVES! DESPAIR NOT FOR THE MERCY OF ALLAAH, VERILY ALLAAH FORGIVES ALL SINS. TRULY HE IS OFT FORGIVING, MOST MERCIFUL." [Az-Zumar (39):53]
Therefore, we should never lose hope or stop asking for Allaah's forgiveness. Its importance is shown to us in a hadeeth in which the Prophet (Sallalaahu Alaihi wa Sallam) said:
"O people! Turn to Allaah in repentance and seek His forgiveness, for surely I make repentance a hundred times every day."
Repentance is such a great act of worship that doing it can totally erase our sins altoghether, as the Prophet, Sallallaahu 'alaihi wa sallam said: "One who repents from sin is like one without sin."
ONLY ALLAAH CAN FORGIVE SINS
Forgiveness for our sins is not something that comes automatically, it is something that must be sought sincerely and with consciousness. Also we should remember that it is only through Allaah's Mercy that anyone will ever enter Paradise. The Prophet (Sallalaahu Alaihi wa Sallam) advised: "Do good deeds properly, sincerely and moderately, and rejoice, for no one's good deeds will put him in Paradise." The Companions asked, "Not even you O Messenger of Allaah?" He replied. "Not even me unless Allaah bestows His pardon and mercy on me."
Therefore in Islaam, salvation rests on faith (which includes), good actions and hope in Allaah's mercy, all combined in truly unique manner which is not found in any other religion or system.
Furthermore, it is only Allaah who can forgive our sins and He is not in need of any intercessor. The proof for this is in a du'aa (supplication) which the Prophet (Sallalaahu Alaihi wa Sallam) taught his closest Companion Abu Bakr(8):
"O Allaah, truly I have wronged myself and none can forgive sins except you."
Therefore it is a complete waste of time asking forgiveness from the people such as "saints", pious people or even the Prophet (Sallalaahu Alaihi wa Sallam). Allaah say in reply to people who do such things:

Source: Ad-Dawah ilaLlaah Magazine Vol 1 , Issue 1