God will not hear our prayers through a Cloud?

So one could say, ‘Don’t pray to Him on a dull day?

There has to be something more here to this passage, than this simple claim, in that He does not hear the prayers of all in their suffering, in this case it was Israel and their failure to repent and when they sought, much like Esau they were turned away!

Today the middle-east is in crises, but does Allah answer the prayers of Muslims, or because of the condition of their hearts full of bitterness and hatred, He refuses them?

What is this cloud made of, it must be something more than an Earthly cloud, more of a closed door in the Heavens, something for now is far beyond our understanding and it may be revealed to us in Eternity!

Lamentations 2:8, 3:44, Genesis 10:14, 27:34.