For all God's promises have been fulfilled in him (Christ).
We all make promises but sometimes we fail to carry them out. Perhaps that may be through no fault of our own or it may be because we just forget or find that we just don't want to keep the promises we made.
In the language of the New Testament there are two words (a noun and a verb) that refer to promises and, except for two places, these words are always referring to the promises God makes. Indeed the Old Testament and the New Testament are full of God's promises and, unlike us, God never fails to keep his promises.
Our Lord Jesus Christ is the great fulfilment of all the Old Testament promises and through Christ we have "better promises" than those of the Old Testament. We have the promise of the Holy Spirit to come and live in the hearts of believers in Jesus; we have the promise of eternal life for all who believe and the promise that the Lord Jesus will come again to establish a new heaven and a new earth. God who makes all these promises — and many more - 'is faithful' (Hebrews 10:23). God is the truth itself, so he will not, indeed cannot, lie. He keeps his promises. That means when he asks you to repent and trust him for salvation, you can trust him — he promises he will do what he says. Guaranteed!
Dear Heavenly Father, I thank you that all your promises are fulfilled in Jesus Christ. Amen.