Hebrews 4:15, 16

Let us, therefore, approach with freeness of speech to the throne of undeserved kindness, that we may obtain mercy and find undeserved kindness for help at the right time.”

While growing to perfection, humans will still be committing sins unintentionally. But by repenting and asking for forgiveness of God through their High Priest Jesus Christ, they will be forgiven and will continue to receive help in overcoming their weaknesses.