His word. His spoken words remain true throughout time, regardless of time.
And whatever God speaks, it becomes law not only to men but also to Himself.
And God keeps His word.
"...so is my word that goes out from my mouth: It will not return to me empty, but will accomplish what I desire and achieve the purpose for which I sent it" Isaiah 55:11
God also promised.
"...For I know the plans I have for you," declares the Lord, "plans to prosper you and not to harm you, plans to give you hope and a future." Jeremiah 29:11
God, I thank you that everyday, my only choice is to trust in You.