Psalms 11:4

The shaking of a tree (they say) makes it take the deeper and faster root. The attempt of David's enemies to discourage his confidence in God engages him to cleave so much the more closely to his first principles, and to review them, which he here does, abundantly to his own satisfaction and the silencing of all temptations to infidelity. That which was shocking to his faith, and has been so to the faith of many, was the prosperity of wicked people in their wicked ways, and the straits and distresses which the best men are sometimes reduced to: hence such an evil thought as this was apt to arise, Surely it is vain to serve God, and we may call the proud happy. But, in order to stifle and shame all such thoughts, we are here called to consider, I. That there is a God in heaven: The Lord is in his holy temple above, where, though he is out of our sight, we are not out of his. Let not the enemies of the saints insult over them, as if they were at a loss and at their wits' end: no, they have a God, and they know where to find him and how to direct their prayer unto him, as their Father in heaven. Or, He is in his holy temple, that is, in his church; he is a God in covenant and communion with his people, through a Mediator, of whom the temple was a type.

— Matthew Henry's Concise Commentary (public domain)

temple . . . heaven--The connection seems to denote God's heavenly residence; the term used is taken from the place of His visible earthly abode (Psa 2:6; Psa 3:4; Psa 5:7). Thence He inspects men with close scrutiny.

— Jamieson-Fausset-Brown Commentary (public domain)