Matthew Poole and continuators on Isaiah 42:21

21 The LORD is well pleased for his righteousness sake , he will magnifie the Law, and make it honourable .

To wit, with you: Or, as this word is most commonly used, hath a good will, to you or to this People: which may be understood out of the following verse, as is very usual in sacred Scripture. The meaning seems to be this; Although thou art a wicked people that rebellest against the clearest light, and therefore God might justly destroy thee suddenly, yet he is very unwilling to do it, and will patiently wait for thy repentance that he may be gracious unto thee.

Not for thy sake, for thou deservest no such thing from him, but for the glory of his own faithfulness, in fulfilling that Promise and Covenant, which he made with thy pious Progenitors for themselves, and for their Seed.

He will maintain the honour of his law, and therefore is not forward to destroy you, who profess Gods Law, and the true Religion, least his Law should upon that occasion be exposed to contempt.

Marginal references: Chap. 59. 16.; Or, him.