If we say that we do not sin, we make him a liar and his word is not in us.

(My little children, I write these things to you so that you might not sin.)

And if anyone sins, we have an ‘advocate’ with the Father, Jesus Christ the righteous. 

And he is the atoning sacrifice for our sins, and not only for our sins but for the whole world. 

Teach us, good Lord,to serve thee as thou deservest;to give and not to count the cost;to fight and not to heed the wounds;to toil and not to seek for rest;to labour and not to ask for any reward,save that of knowing that we do thy will,through Jesus Christ our Lord.Amen
St Ignatius