Luke's focus in Jesus' baptism is on the opening of the heavens, the coming down of the Holy Spirit on Jesus and the words of the Father out of heaven.

With the opening of Heaven we stand before "the humanly incomprehensible and the unfathomable divine" Geldenhuys. "Heaven opens itself, which hitherto was closed, and becomes now at Christ's baptism a door and window so that one can see into it...." - Martin Luther. "We are not told what became visible when the heaven was suddenly opened as we are told in the case of Ezekiel and of Stephen. Yet we may well say that the Heavenly Glory was visible, and that John and any others who were present beheld its radiance." - Lenski