John Wesley

Above all sing spiritually. Have an eye to God in every word you sing. Aim at pleasing him more than yourself, or any other creature. In order to do this attend strictly to the sense of what you sing, and see that your heart is not carried away with the sound, but offered to God continually; so shall your singing be such as the Lord will approve here, and reward you when he cometh in the clouds of heaven.
On how to sing hymns

John Wesley
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Clement

A good workman can accept the reward of his labor with assurance, but one who is idle and shiftless cannot look his employer in the face. That is why we must devote ourselves heart and soul to the task of well-doing, for everything comes from the hand of God and He has already warned us, “See the Lord is approaching, with his reward before him, to pay every man as his work deserves.