Let no soul fear to draw near to Me, even though its sins be as scarlet. My mercy is so great that no mind, be it of man or of angel, will be able to fathom it throughout all eternity. (Words of Jesus to St. Faustina). Diary, Divine Mercy in My Soul, 699.)
The cross is the greatest proof that God is on our side! We should never fear Him, rather let us approach Him with great trust. God's mercy is greater than our sins!