I will stand - , i. e. I would stand now, as a servant awaiting his master,
Upon my watch - or, keep (Isaiah 21:8. משׁמר in the same sense Jeremiah 51:12), and “set me (plant myself firmly) upon the tower” (literally, fenced place, but also one straitened and narrowly hemmed in), “and will watch” (it is a title of the prophets , as spying by God’s enabling, things beyond human ken); I will spy out, to see a long way off, to see with the inward eye, what He will say unto me (literally, Jerome: in me); first revealing Himself in the prophets “within to the inner man;” then, through them. And what I shall answer when I am reproved , or, upon my complaint literally upon my reproof or arguing; which might mean, either that others argued against him, or that he had argued, pleaded in the name of others, and now listened to hear what God would answer in him (See Numbers 12:6, and at Zechariah 1:19), and so he, as taught by God should answer to his own plea. But he had so pleaded with God, repeatedly, why is this? He has given no hint, that any complained of or reproved him.
Theodotion: “By an image from those who, in war and siege, have the ward of the wall distributed to them, he says, I will stand upon my watch.” Cyril: “It was the custom of the saints, when they wished to learn the things of God, and to receive the knowledge of things to come through His voice in their mind and heart, to raise it on high above distractions and anxieties and all worldly care, holding and keeping it unoccupied and peaceful, rising as to an eminence to look around and contemplate what the God of all knowledge should make clear to them. For He hateth the earth-bound and abject mind, and seeks hearts which can soar aloft, raised above earthly things and temporal desires.” The prophet takes his stand, apart from people and the thoughts and cares of this world, on his lonely watch, as Moses on the rock, keeping himself and kept by God, and planted firm, so that nothing should move him, fenced around thought straitened in , as in a besieged camp committed to his ward, looking out from his lofty place what answer God would give as to times long distant, and what answer He should give first to himself, and to those to whom his office lay, God’s people.