Gideon was not very confident or sure about WHO was speaking to him.
"But sir," Gideon replied, "if the LORD is with us, why has all this happened to us? Where are all his wonders that our fathers told us about when they said, 'Did not the LORD bring us up out of Egypt?' But now the LORD has abandoned us and put us into the hand of Midian." (Judges 6:13)
Notice how Gideon addressed the angel of the LORD as "sir". I believe this angel came in human form and is none other than the pre-incarante Christ. Just verses later, after Gideon receives the charge to save Israel, Gideon says, "give me a sign that it is really you talking to me" (Judges 6:17). Gideon now has an inkling but doubts enough to ask for a sign.
Take Away: Don't miss God's visitation(s) in your life! Notice how Gideon and the Pharisees of Jesus' day needed a sign for His presence or identification. Today, if we as believers in Christ are in The Word, we will know His presence and all that He is to us. It is important to know God's perspective on everything, but especially us and our relationship with Him. However, in order to Get The Picture of His Perspective, we can't miss His Presence! So, get alone with God today and everyday.