1 Timothy 1:2 - Matthew Poole's English Annotations on the Holy Bible

He dignifies Timothy with the title of his son in the faith; that is, being converted by him to Christianity, and begat to the Divine life: and by styling Timothy his own son, he signifies his piety and virtue, that rendered him a worthy son of such a father, whom he imitated and honoured, and with whom he corresponded in a grateful, obedient affection. Having thus designated the person to whom he writes, he expresses his ardent desires of his complete felicity; which is included in grace, mercy, and peace. By grace he means the free favour and good will of God, with all the spiritual gifts that proceed from it, either requisite for salvation, or the great work of the evangelical ministry. By mercy, his compassionate tender love, pardoning, relieving, supporting, and assisting us in our Christian course. By peace he signifies, principally, the peace of God, that divine calm of conscience, that tranquillity and rest of soul, which proceeds from the assurance that God is reconciled to us in Christ, and our freedom by the sanctifying Spirit from the tyranny of carnal lusts: this peace can never be to the wicked. And besides this principal peace, we may understand peace with man, that is, a quiet state, exempt from hatred and persecutions, that Timothy might more comfortably and successfully perform the work of his ministry. He prays for these blessings from God, who is the original Fountain of all good: and from Jesus Christ as the channel, by which all the gifts of God are conveyed to us; for without his mediation the Deity is as a sealed fountain, no grace would flow to us. He styles God our Father, because he has adopted us in his Son, and in that quality he communicates his grace, mercy, and peace to us: he styles Christ our Lord, who hath supreme power over us, as well by the right of creation as of redemption.