Obstacles in Knowing Allah Swt

There are many obstacles on the road to knowing Allah the Exalted. Sometimes we see that even though we seem to do everything right and everything that is required of us, we don't seem to be getting closer to Allah. Why is that? Something very specific, very subtle, is holding us back that we might not be aware of. What is that thing? How do we overcome it in order to successfully walk the road to the Divine?