Understanding
Sing With Spirit and Understanding--The evil of formal worship cannot be too strongly depicted, but no words can properly set forth the deep blessedness of genuine worship. When human beings sing with the spirit and the understanding, heavenly musicians take up the strain and join in the song of thanksgiving. He who has bestowed upon us all the gifts that enable us to be workers together with God, expects His servants to cultivate their voices so that they can speak and sing in a way that all can understand. It is not loud singing that is needed, but clear intonation, correct pronunciation, and distinct utterance. Let all take time to cultivate the voice so that God's praise can be sung in clear, soft tones, not with harshness and shrillness that offend the ear. The ability to sing is the gift of God; let it be used to His glory.
Beauty in Singing Not Everything--Many are singing beautiful songs in the meetings, songs of what they will do, and what they mean to do; but some do not do these things; they do not sing with the spirit and the understanding also. So in the reading of the Word of God, some are not benefited, because they do not take it into their very life; they do not practice it.
Hymns for the Occasion--Those who make singing a part of divine worship should select hymns with music appropriate to the occasion, not funeral notes, but cheerful, yet solemn, melodies. The voice can and should be modulated, softened, and subdued.
VSS 433, 434