Psalms 119:120

My flesh trembleth for fear of thee - I know thou art a just and holy God: I know thou requirest truth in the inner parts. I know that thou art a Spirit, and that they who worship thee must worship thee in spirit and in truth; and I am often alarmed lest I fall short. It is only an assurance of my interest in thy mercy that can save me from distressing fears and harassing doubts. It is our privilege to know we are in God's favor; and it is not less so to maintain a continual filial fear of offending him. A true conception of God's justice and mercy begets reverence.

My flesh trembleth for fear of thee - I stand in awe of thee. I shudder at the consciousness of thy presence. See Habakkuk 3:16; Hebrews 12:21; Joel 2:10; Nahum 1:5. There is nothing unaccountable in this. Any man would tremble, should God manifest himself to him as he might do; and it is possible that the mind may have such an overpowering sense of the presence and majesty of God, that the body shall be agitated, lose its strength, and with the deepest alarm fall to the earth. Compare Daniel 10:8; Revelation 1:17. No man could meet one of the departed dead, or a good angel, without this fear; how much less could he meet God!

And I am afraid of thy judgments - Of thy laws or commands. My mind is filled with awe at the strictness, the spirituality, the severity of thy law. Reverence - awe - is one of the essential elements of all true religion.