1 John 1

To those that -

"...confess with thy mouth the Lord Jesus, and shalt believe in thine heart..." (New Testament | Romans 10:9)

...and -

"...say that we have fellowship with him, and walk in darkness, we lie, and do not the truth..." (New Testament | 1 John 1:6)

"But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin." (New Testament | 1 John 1:7)

To walk in His light is to keep His commandments and to strive for righteousness and holiness, for -

"If we say that we have no sin, we deceive ourselves, and the truth is not in us..." (New Testament | 1 John 1:8)

But -

"If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness." (New Testament | 1 John 1:9)

You can sense that faith, repentance, and obedience is a condition of forgiveness and cleansing. For example -

"He that saith he is in the light, and hateth his brother, is in darkness..." (New Testament | 1 John 2:9)

Therefore -

"Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him." (New Testament | 1 John 2:15)

We are to love God over the world for -

"Beloved, if our heart condemn us not, then have we confidence toward God.
22 And whatsoever we ask, we receive of him, because we keep his commandments, and do those things that are pleasing in his sight.
23 And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.
24 And he that keepeth his commandments dwelleth in him, and he in him. And hereby we know that he abideth in us, by the Spirit which he hath given us." (New Testament | 1 John 3:21 - 24)

Therefore -

"...every man that hath this hope in him purifieth himself, even as he is pure." (New Testament | 1 John 3:3)

And if we do this, have faith in Hims, and keep His commandments -

"BEHOLD, what manner of love the Father hath bestowed upon us, that we should be called the sons of God: therefore the world knoweth us not, because it knew him not.
2 Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is." (New Testament | 1 John 3:1 - 2)

Could it be any more clear of man's potential is.