The LORD is good unto them that wait for him, to the soul that seeketh him. The Lord is good ... It is good ... It is good. The repetition of "good" at the beginning of each of the three verses heightens the effect.
Wait for him - (Isaiah 30:18, "Blessed are all they that wait for Him"). Verse 26. Quietly wait - literally, be in silence. Compare Lamentations 3:28 and Psalms 39:2; Psalms 39:9 - i:e., to be patiently quiet under afflictions, resting in the will of God (Psalms 37:7). So Aaron "held his peace" when fire from the Lord devoured his sons Nadab and Abihu, because they had offered strange fire (Leviticus 10:2-3; and Job 40:4-5).
Verse 27. Bear the yoke in his youth - the yoke of the Lord's disciplinary teaching (Psalms 90:12; Psalms 119:71). Calvin interprets it, the Lord's doctrine (Matthew 11:29-30), which is to be received in a docile spirit. The earlier the better; because the old are full of prejudices (Proverbs 8:17; Ecclesiastes 12:1). Jeremiah himself received the yoke both of doctrine and chastisement while he was still "a child" (Jeremiah 1:6-7).
[Yodh (y)]