John Gill Commentary Psalms 62:6

"He only is my rock and my salvation: [He is] my high tower; I shall not be moved." — Psalms 62:6 (ASV)

He only [is] my rock and my salvation
(See Gill 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 Gill on Psalms 62:2).