I have not spoken in secret, in a dark place of the earth: I said not unto the descendants of Jacob, Seek me in vain: I the LORD speak righteousness, I declare things that are right.
All Commentaries on Isaiah 45:19 Go To Isaiah 45
Cyril of Alexandria
AD 444
“I speak righteousness and proclaim truth.” Righteousness, as I take it, means the law, for the law is the arbitrator of righteousness. And truth is the discipline of Christ. For there is a form of truth in the law, and the mystery of Christ lies concealed in its shadows, for Moses wrote about this. So, in speaking of righteousness, truth and power are proclaimed along with it, since it is true that the law is a shadow—and yet in it there remains a form of the truth.