Instead of pretending that we are perfect and never sin, we can throw ourselves on the mercy of God revealed in Jesus Christ, and offer this mercy to others as well.
John 14:21-26
They who have my commandments and keep them are those who love me; and those who love me will be loved by my Father, and I will love them and reveal myself to them.’ Judas (not Iscariot) said to him, ‘Lord, how is it that you will reveal yourself to us, and not to the world?’ Jesus answered him, ‘Those who love me will keep my word, and my Father will love them, and we will come to them and make our home with them. Whoever does not love me does not keep my words; and the word that you hear is not mine, but is from the Father who sent me.
‘I have said these things to you while I am still with you. But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you everything, and remind you of all that I have said to you.
(New Revised Standard Version Bible: Anglicized Edition, copyright © 1989, 1995 National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved worldwide. http://nrsvbibles.org)