Adam Clarke on Proverbs 3:18

She is a tree of life - עץ חיים ets chaiyim, "the tree of lives," alluding most manifestly to the tree so called which God in the beginning planted in the garden of Paradise, by eating the fruit of which all the wastes of nature might have been continually repaired, so as to prevent death for ever. This is an opinion which appears probable enough. The blessings which wisdom - true religion - gives to men, preserve them in life, comfort them through life, cause them to triumph in death, and ensure them a glorious immortality.