1 John 3:2-3
2 Beloved, now we are children of God; and it has not yet been revealed what we shall be, but we know that when He is revealed, we shall be like Him, for we shall see Him as He is.
3 And everyone who has this hope in Him purifies himself, just as He is pure.
The hope we have in Him is that when we see Him we shall become like Him. This hope (confident expectation of good) is the reason we purify ourselves. The words "purifies himself" means to cleanse and to sanctify from that which is morally wrong. This is the responsibility of each individual believer, to cleanse from their life that which is not holy in the sight of God, and to be holy just as He is holy. We cleanse our life from all filthiness of the flesh and spirit awaiting His return. We do so by hiding His Word in our heart that we might not sin against Him. We remove from our life anything that would tempt us to sin. This is what Jesus meant when He said if your hand causes you to sin, cut it off. He was telling us to remove things from out of our reach that would tempt us to sin. If you do sin and miss the mark immediately repent and keep chasing after God. To repent means you simply turn away from whatever sin you commit and turn to God. Finally don’t ever allow the devil nor anyone to make you think God does not love you anymore. He loves you with an everlasting love. God does not know how to not love you, for He is love. Let His love draw you to Him so the power of that love can free you from sin.