incline thine ear. hearken. Hebrew prick up or point thine ear. Not the same word as in Proverbs 2:18.
wisdom. Hebrew. chokma. See note on Proverbs 1:2.
And apply. [then] thou shalt incline or bend thy heart, &c. This is the first step, as Proverbs 2:5 is the result.
understanding. discernment. Hebrew. binah. Note on "wisdom" (Proverbs 1:2), No. 2.