My soul, wait thou only upon God; for my expectation is from Him.  He only is my rock and my salvation: He is my defence; I shall not be moved. Psalm 62:5-6

The following is from John Gill’s Exposition of the Bible of Psalm 62 verses  5 and 6.

My soul, wait thou only upon God,…. Be silent and subject to him, acquiesce in his providences, rest in him patiently and quietly, wait for his salvation; See Gill on Psa_62:1; perhaps some new temptation might arise, and David’s soul began to be uneasy and impatient; for frames are very changeable things; and therefore he encourages it to be still and quiet, and patiently wait on the Lord, and on him only:
for my expectation is from him; or “my hope”, as the Targum; the grace of hope is from the Lord, and the thing hoped for is from him; he is the author and the object of it; and his word of promise encourages to the exercise of it; or “my patience”; as the Septuagint, Vulgate Latin, and Arabic versions. The grace of patience is from the Lord; the means of it is his word; and it is exercised, tried, and increased by afflictions sent and sanctified by him; and “expectation” is nothing else than these graces in exercise, a waiting patiently for things hoped for Old Testament saints expected the first coming of Christ; New Testament saints expect his second coming; and all expect good things from him in time and eternity; nor shall their expectation fail and perish; and therefore is a reason why their souls should wait only on the Lord.

He only is my rock and my salvation,…. See Gill on Psa_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 Psa_62:2.

For God to be your rock and salvation you need to come to Him by way of the cross of Jesus Christ. On the cross Jesus paid our debt that we could not pay and have everlasting life, Jesus was buried taking away our sin, our guilt, our condemnation and death, then Jesus came out of the grave alive forever more. Come to Him. Call on His name in faith and repentance.