When we find the connection with Allah and we realize we are the friends of Allah, we have Allah on our side. This is the solution to the self-doubt that many of us face today.
Everything that is in the heavens and everything that is on Earth is the sole property of Allah. Everything is within the grasp of Allah. Everything is in His control and nothing escapes His power.
This is the perspective that we should have. We have to believe we can have that connection with Allah. We can strengthen ourselves. We have to go and find it in our relationship with Allah.
If we are able to do this then there will be nothing in this world that will make us doubt ourselves.