his own bitterness = the bitterness of his soul (Hebrew. nephesh.App-13). Illustrations: Hannah (1Sa_1:8-13); Joab (2Sa_19:5-7); the Shunammite (2Ki_4:27); Haman (Est_5:13); Job (Job 3); Herod (Mar_6:16).
a stranger = an apostate. Hebrew. zur. See note on Pro_2:16; Pro_5:3.