Albert Barnes Commentary Psalms 62:2

"He only is my rock and my salvation: [He is] my high tower; I shall not be greatly moved." — Psalms 62:2 (ASV)

He only is my rock ... - See the notes at Psalms 18:2.

I shall not be greatly moved - The word "greatly" here, or "much"—meaning, “I shall not be much moved”—implies that he did not anticipate perfect security from danger or calamity. He did not suppose that he would escape all disaster or trouble, but he felt that no great evil would befall him, that his most important interests were safe, and that he would ultimately be secure. He would be restored to his home and his throne, and would be favored with future peace and tranquility.

None of us can hope to escape calamity entirely in this life. It is enough if we can be assured that our great interests will ultimately be secured and that we will be safe at last in the heavenly world. Having that confidence, the soul can and should be calm; and we need fear little of what will occur in this world.