There is a difference between a doubt that desires God's promise and a doubt that denies God's promise.

When you mess up, learn to run to God not away from Him.

You may do incredible things for God but your works will never earn you salvation, they were not meant for that.

Who has bewitched you that you should not obey the truth, before whose eyes Jesus Christ was clearly portrayed among you as crucified?

Did you receive the Spirit by the works of the law, or by the hearing of faith?

Are you so foolish? Having begun in the Spirit, are you now being made perfect by the flesh?

Have you suffered so many things in vain — if indeed it was in vain?

Therefore He who supplies the Spirit to you and works miracles among you, does He do it by the works of the law, or by the hearing of faith?

Then He said, "Take now your son, your only son Isaac, whom you love, and go to the land of Moriah, and offer him there as a burnt offering on one of the mountains of which I shall tell you."

For God so loved the world that He gave His only begotten Son, that whoever believes in Him should not perish but have everlasting life.

You believe that there is one God. You do well. Even the demons believe — and tremble!

9 that if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved. 10 For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation.

25 Jesus said to her, "I am the resurrection and the life. He who believes in Me, though he may die, he shall live.  26 And whoever lives and believes in Me shall never die. Do you believe this?"

Now all glory to God, who is able to keep you from falling away and will bring you with great joy into his glorious presence without a single fault.

being confident of this very thing, that He who has begun a good work in you will complete it until the day of Jesus Christ;

28 Then they said to Him, "What shall we do, that we may work the works of God?"
29 Jesus answered and said to them, "This is the work of God, that you believe in Him whom He sent."

And the ark rested in the seventh month, on the seventeenth day of the month, upon the mountains of Ararat.