Charles H. Spurgeon on Psalms 64:1

Hear my voice, O God, in my prayer. It often helps devotion if we are able to use the voice and speak audibly; but even mental prayer has a voice with God which he will hear. We do not read that Moses had spoken with his lips at the Red Sea, and yet the Lord said to him, "Why criest thou unto me?" Prayers which are unheard on earth may be among the best heard in heaven. It is our duty to note how constantly David turns to prayer; it is his battle axe and weapon of war; he uses it under every pressure, whether of inward sin or outward wrath, foreign invasion or domestic rebellion. We shall act wisely if we make prayer to God our first and best trusted resource in every hour of need. Preserve my life from fear of the enemy. From harm and dread of harm protect me; or it may be read as an expression of his assurance that it would be so; "from fear of the foe thou wilt preserve me." With all our sacrifices of prayer we should offer the salt of faith.