The Lord GOD has given Me the tongue of disciples, That I may know how to sustain the weary one with a word. He awakens Me morning by morning, He awakens My ear to listen as a disciple. The Lord GOD has opened My ear; And I was not disobedient Nor did I turn back. (Isaiah 50:4-5)

This is Messiah’s soliloquy about being perfected through obedience and sufferings. (John MacArthur)

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As an acceptable preacher. Isaiah, a prophet, was qualified for the work to which he was called, so were the rest of God’s prophets, and others whom he employed as his messengers; but Christ was anointed with the Spirit above his fellows. To make the man of God perfect, he has the tongue of the learned, to know how to give instruction, how to speak a word in season to him that is weary. God, who made man’s mouth, gave Moses the tongue of the learned, to speak for the terror and conviction of Pharaoh. He gave to Christ the tongue of the learned, to speak a word in season for the comfort of those that are weary and heavily laden under the burden of sin. (Matthew Henry)