Genuine Repentance.

Acts_2-38: Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost.

Text:

Matthew 21: 28-30
28 But what think ye? A certain man had two sons; and he came to the first, and said, Son, go work to day in my vineyard.
29He answered and said, I will not: but afterward he repented, and went.
30 And he came to the second, and said likewise. And he answered and said, I go, sir: and went not.

Salvation

2 Corinthians 5:16-21
16 No longer, then, do we judge anyone by human standards. Even if at one time we judged Christ according to human standards, we no longer do so.
17Anyone who is joined to Christ is a new being; the old is gone…