Hebrews 5:8

Though he were a Son
The Son of God, as the Vulgate Latin version reads; not by creation, nor by adoption, nor by office, but by nature, being the only begotten of the Father, having the same nature and perfections with him:

yet learned he obedience;
not to his parents, or civil magistrates, though that is true; nor merely to the precepts of the law, which he did; but unto death: through sufferings he became obedient to death, even the death of the cross: and this he learnt; not that he was ignorant of the nature of it; nor was he destitute of an obedient disposition to it; but the meaning is, he had an experience of it, and effected it; and which was voluntary, and done in our room and stead; and is the rule and the measure of our righteousness before God: and this he learned,

by the things which he suffered;
from men, from devils, and from the justice of God. Christ's sonship did not exempt him from obedience and sufferings; this shows the dignity of Christ's person, that he is the Son of God, not as Mediator, for as such he is a servant; and it would be no wonder that he should learn obedience as a servant; and this shows also the great humility and condescension of Christ in obeying and suffering for us; though so great a person; and likewise the vile nature of sin, and the strictness of divine justice: and we may learn from hence, not to expect to be exempted from sufferings on account of sonship; nor to conclude we are not sons, because we suffer; and that afflictions are instructive, and by them experience is learned.