Hebrews 13:5 quotes God's promise in emphatic Greek construction: "I will never leave thee, nor forsake thee." The phrase uses a double negative — ou mē — which intensifies the negation beyond ordinary usage. It is closer to: "I will absolutely, certainly never leave you." This promise is stated as a fact about God's character, not as something conditioned on the ability to feel it. The silence is not evidence of absence. God's presence is not contingent on its own perceptibility.
Isaiah 45:15 contains one of the most honest theological admissions in the Old Testament: "Verily thou art a God that hidest thyself, O God of Israel, the Saviour." This is not a complaint — it is a declaration. The hiddenness of God is named as a real characteristic, not denied. God is the one who hides himself and is nonetheless the Saviour. The hiddenness and the salvation coexist. The silence is not the same as the absence.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.