And if his prayer does not ascend appropriately, they expel him to the outside, and they shut the door in his face. And about that is stated: (Prov. 1:28) Then shall they call me, but I shall not answer, they will seek me out early, but they will not find me.
And so it is, when each-and-every individual of Israel calls to the blessed Holy One, through the recitation of the Shm’a, or in prayer, or through any precept, if the Shekhinah is not there, then He does not descend there.
It is this that is written: (Ex. 20:24)... in every place where I cause mention of My Name, I shall come to you, and I shall bless you. And Onqelos translated this to mean: ‘in every place that ‘My Presence’ (Shekhinti) resides, there... etc.’