Messiah, as “the servant of Jehovah” (Isa 42:1), declares that the office has been assigned to Him of encouraging the “weary” exiles of Israel by “words in season” suited to their case; and that, whatever suffering it is to cost Himself, He does not shrink from it (Isa 50:5, Isa 50:6), for that He knows His cause will triumph at last (Isa 50:7, Isa 50:8).
learned - not in mere human learning, but in divinely taught modes of instruction and eloquence (Isa 49:2; Exo 4:11; Mat 7:28, Mat 7:29; Mat 13:54).
speak a word in season - (Pro 15:23; Pro 25:11). Literally, “to succor by words,” namely, in their season of need, the “weary” dispersed ones of Israel (Deu 28:65-67). Also, the spiritual “weary” (Isa 42:3; Mat 11:28).
wakeneth morning by morning, etc. - Compare “daily rising up early” (Jer 7:25; Mar 1:35). The image is drawn from a master wakening his pupils early for instruction.
wakeneth ... ear - prepares me for receiving His divine instructions.
as the learned - as one taught by Him. He “learned obedience,” experimentally, “by the things which He suffered”; thus gaining that practical learning which adapted Him for “speaking a word in season” to suffering men (Heb 5:8).