My dear grandfather was very fond of Dr. Watts’s hymns, and my grandmother, wishing to get me to learn them, promised me a penny for each one that I should say to her perfectly. I found it an easy and pleasant method of earning money, and learned them so fast that grandmother said she must reduce the price to a halfpenny each, and afterwards to a farthing, if she did not mean to be quite ruined by her extravagance. There is no telling how low the amount per hymn might have sunk, but grandfather said that he was getting overrun with rats, and offered me a shilling a dozen for all I could kill. I found, at the time, that the occupation of rat-catching paid me better than learning hymns, but I know which employment has been the more permanently profitable to me. No matter on what topic I am preaching, I can even now, in the middle of any sermon, quote some verse of a hymn in harmony with the subject; the hymns have remained with me, while those old rats for years have passed away, and the shillings I earned by killing them have been spent long ago.
C.H. Spurgeon, Autobiography