2.

For a "Psalm" is a song, not any kind of song, but a song to a psaltery. A psaltery is a kind of instrument of music, like the lyre and the harp, and such kinds of instruments, which were invented for music. He therefore who singeth Psalms, not only singeth with his voice, but with a certain instrument besides, which is called a psaltery, he accompanieth his voice with his hands. Wilt thou then sing a Psalm? Let not thy voice alone sound the praises of God; but let thy works also be in harmony with thy voice....To please then the ear, sing with thy voice; but with thy heart be not silent, with thy life be not still. Thou devisest no fraud in thy heart: thou singest a Psalm to God. When thou eatest and drinkest, sing a Psalm: not by intermingling sweet sounds suited to the ear, but by eating and drinking moderately, frugally, temperately: for thus saith the Apostle, "whether ye eat or drink, or whatever ye do, do all to the glory of God." ¹ ...If by immoderate voracity thou exceedest the due bounds of nature, and gluttest thyself in excess of wine, however great praises of God thy tongue sound, yet thy life blasphemeth Him. After food and drink thou liest down to sleep: in thy bed neither commit any pollution, nor go beyond the license given by the law of God: let thy marriage bed be kept chaste with thy wife: and if thou desire to beget children, yet let there not be unbridled sensuality of lust: in thy bed give honour to thy wife, ² for ye are both members of Christ, both made by Him, both renewed by His Blood: so doing thou praisest God, nor will thy praise be altogether silent. What, when sleep has come over thee? Let not an evil conscience rouse thee from rest: so doth the innocence of thy sleep praise God....