Luke 12:50 - Ellicott's Commentary On The Whole Bible

I have a baptism to be baptized with. — Here we have a point of contact with the words spoken to the sons of Zebedee. (See Notes on Matthew 20:22, and Mark 10:38.) The baptism of which the Lord now speaks is that of one who is come into deep waters, so that the floods pass over him, over whose head have passed and are passing the waves and billows of many and great sorrows. Yet here, too, the Son of Man does not shrink or draw back. What He felt most keenly, in His human nature, was the pain, the constraint of expectation. He was, in that perfect humanity of His, harassed and oppressed, as other sufferers have been, by the thought of what was coming, more than by the actual suffering when it came.