Notice once more, that it is a present forgiveness. It does not say I am he that will blot out thy transgressions, but that blotteth them out now. There are some who believe, or at least seem to imagine, that it is not possible to know whether our sins are forgiven in this life. We may have hope, it is thought, that at last there will be a balance to strike on our side. But this will not satisfy the poor soul who is really seeking pardon, and is anxious to find it; and God has therefore blessedly told us, that he blotteth out our sin now; that he will do it at any moment the sinner believes. As soon as he trusts in his crucified God, all his sins are forgiven, whether past, present, or to come. Even supposing that he is yet to commit them, they are all pardoned. If I live eighty years after I receive pardon, doubtless I shall fall into many errors, but the one pardon will avail for them as well as for the past. Jesus Christ bore our punishment, and God will never require at my hands the fulfilment of that law which Christ has honored in my stead; for then would there be injustice in heaven: and that be far from God. It is no more possible for a pardoned man to be lost than for Christ to be lost, because Christ is the sinner’s surety. Jehovah will never require my debt to be paid twice. Let none impute injustice to the God of the whole earth: let none suppose that he will twice exact the penalty of one sin. If you have been the chief of sinners, you may have the chief of sinner’s forgiveness, and God can bestow it now.
From the Metropolitan Tabernacle Pulpit, Volume 1, Sermon 24 by Charles Haddon Spurgeon
Here is another passage where Jesus’ words (and actions) demonstrated that He is truly God in the flesh. It involves His teaching ministry and the religious leaders of His day learned more than they could handle.
And it came to pass on a certain day, as he was teaching, that there were Pharisees and doctors of the law sitting by, which were come out of every town of Galilee, and Judaea, and Jerusalem: and the power of the Lord was present to heal them. 18 And, behold, men brought in a bed a man which was taken with a palsy: and they sought means to bring him in, and to lay him before him. 19 And when they could not find by what way they might bring him in because of the multitude, they went upon the housetop, and let him down through the tiling with his couch into the midst before Jesus. 20 And when he saw their faith, he said unto him, Man, thy sins are forgiven thee. 21 And the scribes and the Pharisees began to reason, saying, Who is this which speaketh blasphemies? Who can forgive sins, but God alone? 22 But when Jesus perceived their thoughts, he answering said unto them, What reason ye in your hearts? 23 Whether is easier, to say, Thy sins be forgiven thee; or to say, Rise up and walk? 24 But that ye may know that the Son of man hath power upon earth to forgive sins, (he said unto the sick of the palsy,) I say unto thee, Arise, and take up thy couch, and go into thine house. 25 And immediately he rose up before them, and took up that whereon he lay, and departed to his own house, glorifying God. (Luke 5:17-25)
First, notice the priority of the lame man’s friends. They had to get him to Jesus! And they weren’t above destroying the roof of the house to do it! This prompted an immediate response from Jesus.