The priest kisses the altar and turns to the faithful. In kissing the altar – which represents our Lord – the Roman Daily Catholic Missal explains that the priest “breathes in, so to speak, the love and spirit of Jesus Christ .”
The Priest having received the gift of the love and spirit of Jesus now extends it to the faithful with the words, “The Lord be with you.” This gift rebounds back to him with our response, “And with thy spirit.”
It was a look of love directed at Peter which converted him. We, too, are invited to respond like Peter with love and fidelity in carrying our crosses of daily duty.
We may pray in this vein: “ Lord Jesus Christ, who, mercifully looking back on Peter, caused him to bitterly weep for his offence, look on me, I beseech Thee, with the eye of Thy mercy, that I may fully lament my sins and hereafter, faithfully follow Thee all the rest of my life, my Lord and my God. Amen.”
The Dominus Vobiscum is not used at this point in the Novus Ordo.