Psalms 62:6

He only [is] my rock and my salvation,....

[See comments on Psalms 62:2];

[he is] my defence; these epithets of God are repeated, to strengthen his faith and hope in him, and to encourage a patient waiting upon him;

I shall not be moved; neither greatly, nor at all; his faith gets fresh strength and rigour, the more he considers God as his rock, salvation, defence, and refuge; [See comments on Psalms 62:2].