And the angel of the LORD appeared unto him, and said unto him, The LORD is with thee, thou mighty man of valor.

Wesley's Notes

6:12 Is with thee - That is, will assist thee against thine enemies. Man of valour - To whom I have given strength and courage for this end.

Matthew Henry's Concise Commentary

6:11-24 Gideon was a man of a brave, active spirit, yet in obscurity through the times: he is here stirred up to undertake something great. It was very sure that the Lord was with him, when his Angel was with him. Gideon was weak in faith, which made it hard to reconcile the assurances of the presence of God with the distress to which Israel was brought. The Angel answered his objections. He told him to appear and act as Israel's deliverer, there needed no more. Bishop Hall says, While God calls Gideon valiant, he makes him so. God delights to advance the humble. Gideon desires to have his faith confirmed. Now, under the influences of the Spirit, we are not to expect signs before our eyes such as Gideon here desired, but must earnestly pray to God, that if we have found grace in his sight, he would show us a sign in our heart, by the powerful working of his Spirit there, The Angel turned the meat into an offering made by fire; showing that he was not a man who needed meat, but the Son of God, who was to be served and honoured by sacrifice, and who in the fulness of time was to make himself a sacrifice. Hereby a sign was given to Gideon, that he had found grace in God's sight. Ever since man has by sin exposed himself to God's wrath and curse, a message from heaven has been a terror to him, as he scarcely dares to expect good tidings thence. In this world, it is very awful to have any converse with that world of spirits to which we are so much strangers. Gideon's courage failed him. But God spoke peace to him.