As the Lord spoke through Ezekiel about the division of the land for Israel, the Lord said to the tribes,
“You shall inherit it equally with one another; for I raised My hand in an oath to give it to your fathers, and this land shall fall to you as your inheritance” (Ezekiel 47:13-20).
The Lord keeps His word no matter what, and the Bible shows it repeatedly.
Therefore, when you read one of His promises, you can know that it will happen. For example, He promises that when you sin, if you confess your sin, and repent of it, He will forgive you.
If He has forgiven you, then you do not have to worry whether you have been forgiven or whether you need to forgive yourself. He has forgiven you. Rejoice in it and enjoy it!