“obedience is the foundation of true worship”

“If we desire, therefore, that he should approve of the honor which we confer upon him, we ought always to consider what he requires. And, indeed, they who venture to offer to God honors invented by themselves are chargeable with using some sort of force and violence towards him; for obedience is the foundation of true worship. Let us also learn from it with what reverence we ought to abide by the pure and simple word of God; for as soon as we turn aside in the smallest degree, the truth is poisoned by our leaven, so that it is no longer like itself.”

John Calvin, Commentary on John 6:15

“Therefore, when we have looked thoroughly, and searched here and there, we shall not find better songs nor more fitting for the purpose, than the Psalms of David, which the Holy Spirit spoke and made through him.”

“What is there now to do? It is to have songs not only honest, but also holy, which will be like spurs to incite us to pray to and praise God, and to meditate upon his works in order to love, fear, honor and glorify him. Moreover, that which St. Augustine has said is true, that no one is able to sing things worthy of God except that which he has received from him. Therefore, when we have looked thoroughly, and searched here and there, we shall not find better songs nor more fitting for the purpose, than the Psalms of David, which the Holy Spirit spoke and made through him. And moreover, when we sing them, we are certain that God puts in our mouths these, as if he himself were singing in us to exalt his glory. Wherefore Chrysostom exhorts, as well as the men, the women and the little children to accustom themselves to singing them, in order that this may be a sort of meditation to associate themselves with the company of the angels.”

From the Preface to the 1565 Geneva Psalter by John Calvin