It is comforting to know that whenever we sin we can be restored to fellowship with Christ through repentance and confession.
I grew up to the strains of the centuries old Anglican liturgy (see below). Every service included the Confession, which I would pray knowing I would "err and stray like a lost sheep" again prior to repeating the same prayer in the next service.
I have learnt that just knowing Christ forgave all our sins at Calvary isn't enough to stop anyone from sinning. That requires discipline.
Then shall this general Confession be made, in the name of all those that are minded to receive the holy Communion, by one of the Ministers; both he and all the people kneeling humbly upon their knees, and saying,
ALMIGHTY God, Father of our Lord Jesus Christ, Maker of all things, judge of all men; We acknowledge and bewail our manifold sins and wickedness, Which we, from time to time, most grievously have committed, By thought, word, and deed, Against thy Divine Majesty, Provoking most justly thy wrath and indignation against us. We do earnestly repent, And are heartily sorry for these our misdoings; The remembrance of them is grievous unto us; The burden of them is intolerable. Have mercy upon us, Have mercy upon us, most merciful Father; For thy Son our Lord Jesus Christ’s sake, Forgive us all that is past; And grant that we may ever hereafter Serve and please thee In newness of life, To the honour and glory of thy Name; Through Jesus Christ our Lord. Amen.
Then shall the Priest (or the Bishop, being present,) standing up, and turning himself to the people, pronounce this Absolution.
ALMIGHTY God, our heavenly Father, who of his great mercy hath promised forgiveness of sins to all them that with hearty repentance and true faith turn unto him; Have mercy upon you; pardon and deliver you from all your sins; confirm and strengthen you in all goodness; and bring you to everlasting life; through Jesus Christ our Lord. Amen