The Father"s voice from heaven expressed approval of Jesus and His mission in words recalling Genesis 22:2. What the voice said identified the speaker. God"s words from heaven fused the concepts of King ( Psalm 2:7) and Servant ( Isaiah 42:1). This combination constituted the unique sonship of Jesus. [source][source][source]
"The first clause of the  declaration (with the verb in the present tense of the indicative mood) expresses an eternal and essential relationship. The second clause (the verb is in the aorist indicative) implies a past choice for the performance of a particular function in history." [source]
From this point on, the reader of Mark"s Gospel knows God"s authoritative evaluation of Jesus. This evaluation becomes the norm by which we judge the correctness or incorrectness of every other character"s understanding of Him. [source][source][source]
"If Mark refuses knowledge of Jesus" identity to human characters in the beginning and middle of his story, who, then, knows of his identity? The answer is Mark himself as narrator, the reader, and such supernatural beings as God, Satan, and demons." [source]
Jesus began His official role as the Messiah at His baptism (cf. 2 Samuel 7:12-16; Psalm 89:26; Hebrews 1:5). He also began His official role as the Suffering Servant of the Lord then (cf. Mark 8:31; Mark 9:30-31; Mark 10:32-34; Mark 10:45; Mark 15:33-39). [source][source][source]
"Jesus" baptism did not change His divine status. He did not become the Son of God at His baptism (or at the transfiguration, Mark 9:7). Rather, His baptism showed the far-reaching significance of His acceptance of His messianic vocation as the suffering Servant of the Lord as well as the Davidic Messiah. Because He is the Son of God, the One approved by the Father and empowered by the Spirit, He is the Messiah (not vice versa)." [source]
Mark 1:1-20 - The Beginning Of Jesus' Ministry
The ministry of John the Baptist, Mark 1:1-8. Always the message of John precedes that of Jesus Christ; first the changed attitude of the will, then faith. The greatness of the Baptist revealed itself in his humility. He saw what we must see, that a negative religion, symbolized by water, is not enough: we need to be set on fire.
The opening pages of Christ's public life, Mark 1:9-20. Jesus was recognized by the Baptist, who beheld the opened heavens and the descending Spirit. If the Lord was thus anointed ere He commenced His life-work, how much more must we be! Hast thou become united with Him in His death, made one with Him in His resurrection, and anointed by that same Spirit? Then be sure that thou, too, must be tempted. Sons of men must go the way of the Son of man, now under the opened heavens, then tempted of the devil; on one side the wild beasts, on the other the angels; now driven to loneliness, and then to the crowded street of the cities, there to gather disciples by the energy and beauty of a victorious life. [source]
Chapter Summary: Mark 1
1The office of John the Baptist 9Jesus is baptized; 12tempted; 14he preaches; 16calls Peter, Andrew, James, and John; 23heals one that had a demon; 29Peter's mother in law; 32many diseased persons; 40and cleanses the leper
What do the individual words in Mark 1:11 mean?
Anda voicecameout oftheheavensYouaretheSonof MebelovedinYouI am well pleased