John Trapp on Isaiah 65:16

Ver. 16. That he who bleſſeth himſelf in the earth, &c.] Or, that bleſſeth, either himſelf or any other.

Shall bleſs himſelf in the God of truth] Heb. ſhall bleſs in the God of Amen, that is, ſay ſome, in Chriſt who is Amen the faithful and true witneſs, Rev. 3.14. in whom all the Promiſes are Yea and Amen, 2 Cor. 1.20. and who was wont often to ſay Amen, Amen. Others render it thus, Benedicat ſibi per Deum firmi, ſhall bleſs himſelf by the God of the firm or faithful people, founded and rooted in God, ſo as that the gates of Hell ſhall not prevail againſt them.

Shall ſwear by the God of truth] Or, by the God of the firm and faithful people, as before.

Becauſe the former troubles are forgotten] Rememberd no otherwiſe then as waters that are paſt. See Zach. 10.6. with the Note.