Augustine of Hippo
What distinguishes the vows? The key difference lies in your self-examination and your ability to honor Him: recognize yourself as His creation while acknowledging Him as your Creator; see yourself as darkness and Him as your Light, to whom you will declare, "You will illuminate my lamp, O Lord my God, You will enlighten my darkness." For when you question your soul regarding what aspect of you is light, clarity will elude you. If you lack discernment, your vows will lack distinction. Offer clear vows, acknowledging your changeable nature and His immutable essence: recognize that without Him, you are nothing, while He is complete without you; understand your need for Him, while He has no need for you.
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Cry out to Him, as I have said to the Lord, "You are my God, my good deeds do not require You." Even if God receives you as a sacrifice, He experiences no gain, no increase, no enhancement in His state: all that He creates from you benefits you, not Him. If you grasp this truth, you will form vows to your God that your mouth has proclaimed.