Charles H. Spurgeon on Psalms 119:102

Thou hast taught me. God teacheth two ways: 1. By common illumination. 2. By special operation.

1. By common illumination, barely enlightening the mind to know or understand what he propounds by his messengers: so God showed it to the heathen: Romans 1:20. But then, 2. By way of special operation, effectually inclining the will to embrace and prosecute duties so known: "I will put my law in their inward parts, and write it in their hearts": Jeremiah 31:33. This way of teaching is always effectual and persuasive. Now, in this sense they are taught of God, so that they do not only get an ear to hear, but a heart to understand, learn, and practise.

This teaching is the ground of constancy, because, (1) They that are thus taught of God see things more clearly than others do; God is the most excellent teacher. (2) They know things more surely, and with certainty of demonstration, whereas others have but dubious conjectures, and loose and wavering opinions about the things of God. (3) This teaching is so efficacious and powerful, as that the effect followeth: "Teach me thy way, O Lord; I Will walk in thy truth" (Psalms 86:11). (4) God renews this teaching, and is always at hand to guide us, and give counsel to us, which is the cause of our standing. Thomas Manton.