In the third place he comes on to the chiefe Organ, that is, the instrument wherewith they should sing. It is not with the Organs of the Papists, no not with thy tongue; but it is with the heart, and with the affection of a well-ruled heart. Therefore as a fiddler, or any that playes on an Instrument tempers his Instrument, that a sweete harmonie may be heard of it: Even so before thou sing, temper thou thy heart; and let thy song rise, not from thy throte, but from the depth of thine heart, that is from thine affections set upon God.
Robert Rollock
praise, singing