Augustine of Hippo

"But the counsel of the Lord stands for ever;" but the counsel of the Lord, whereby He makes none blessed but him that submits unto Himself, stands for ever. The thoughts of His Heart to all generations [Psalm 33:11]: the thoughts of His Wisdom are not mutable, but endure to all generations.

Exposition on Psalm 33 ↗

Thomas Aquinas

Then when he says, "But the counsel," the stability of God is set forth, because his counsel stands and his thought perseveres. But is there counsel in God? It seems not, because it implies doubt. I respond: it must be said that counsel is understood differently in God and in us. For knowledge in us implies discursive reasoning, but in God it implies certitude. So with counsel: when it is in us, it denotes inquiry; but when it is said of God, it implies ordering of all things to their due end. Is. …

Exposition on the Psalms of David ↗

Bonaventure

Ecclesiasticus says: 'Before all works let a true word precede you, and before every act a stable counsel.' The true word, which can neither be deceived nor deceive, is the only-begotten Son of God and his doctrine and his life. Let this word precede you and this stable counsel. Stable counsel is none other than that of my God; 'the counsel of the Lord remains forever.'

Collationes de Septem Donis, Collation 7 ↗