This is the common salutation in all Paul's Epistles, only in one or two mercy is also added. Grace signifies free love. Peace signifies either a reconciliation with God, or brotherly love and unity each with other: See Poole on "Romans 1:7". The apostle wisheth them spiritual blessings, and the greatest spiritual blessings, grace and peace, and that not from and with men, but from God our Father, and the Lord Jesus Christ.
Related Commentaries of 1 Corinthians 1:3
1 Corinthians 1:3
3 Grace be unto you, and peace, from God our Father, and from the Lord Jesus Christ.