O God, thou art terrible out of thy holy places - The places where thou dwellest, and from which thou dost manifest thyself. That is, The manifestations which thou dost make of thyself when thou seemest to come forth from thine abode are “terrible,” or are suited to fill the mind with awe. Compare Psalms 45:4, note; Psalms 65:5, note; Psalms 66:5, note.
The God of Israel - The God who is adored by Israel, or by his true people; our God.
Is he that giveth strength and power unto his people - He is not weak and feeble. He is able to protect them. He shows that he can gird them with strength; that he can defend them; that he can sustain them in the trials of life. The God whom they acknowledge as their God is not one whose strength fails, or who is seen to be feeble and powerless when his aid is needed. He is fully equal to all their needs, and they never trust him in vain. “Blessed be God.” For all that he is, for all that he has done. This is the language of joy and praise in view of the contemplation of his character as depicted in the psalm. At the close of every right contemplation of his character, his government, his plans, his claims, his law, his gospel, the heart that is right will say, “Blessed be such a God.” To one endowed with “such” attributes, praise - everlasting praise - is due.