Genesis 12:1, 2, 3, 12
Abraham was not very different in a sense, than we are in our faith in God, because although he had a strong faith in God and his promises, he had an occasion, where he really did not believe what God had promised him, and he was afraid, that he will lose his life, as we read, in the book of Genesis chapter 12.
Now, when we read Genesis 12:1, 2, 3, we can see very clearly, that God had already promised Abraham, that he will make him into a great nation. And then, we go to verse 12 in the same chapter, and we see the fearful Abraham, who was in Egypt with his wife, and was scared to death, because he thought, the Egyptians will kill him, and take his wife for themselves.
Now, that kind of fear in the heart of Abraham, displays only one thing, lack in trust in God’s protection, and lack in faith, in what God has already promised him, in Genesis 12, 1, 2, 3. If Abraham really believed the promises of God, which are written in Genesis 12:1, 2, 3, then he would certainly, not be afraid about losing his life, and his wife too, because the very promises of God, would encourage him to continue to believe God, that everything will be fine, with himself and his wife.
In contrast, we can read in Romans 4:18-21, that Abraham is displayed, as the great man of faith, who believed the promise of God, that his wife will have a child, in her old age. That description of the strong faith of Abraham, in the promise of God, is powerful. And yet, although Abraham knew his God and trusted him, he had his moments, of doubting the promises of God which were personally for himself, and was afraid of losing his life, in Genesis 12:12.
So sometimes if we catch ourselves, doing a similar thing like Abraham, doubting the promises of God for ourselves, let us not beat ourselves up, and let us not feel miserable and hopeless, but let us remind ourselves that there is always chance for us, to start believing God for his promises, just as we should.