Now concerning virgins I have no commandment of the Lord: yet I give my judgment, as one that hath obtained mercy of the Lord to be faithful.
Now ... (Greek, 'But') no commandment of the Lord: yet ... my judgment - I have no authoritative commandment from the Lord as to their abiding in their state (1 Corinthians 7:20), but I give my opinion (cf. 1 Corinthians 7:40; 1 Corinthians 14:37; 1 Thessalonians 4:15). The Lord inspires me to give you only a recommendation, which you are free to adopt or reject (1 Corinthians 7:10-11). It was a positive command, for the Lord had already made known His will (Malachi 2:14-15; Matthew 5:31-32). In 1 Corinthians 7:12 the Old Testament commandment of God to put away strange wives (Ezra 10:3), Paul by the Spirit revokes.
Mercy of the Lord (1 Timothy 1:13). He attributes his gifts (including inspiration) to God's grace alone.
Faithful - trustworthy in dispensing the inspired directions received by me from the Lord.