[Apostle Heber J. Grant Diary]
Some months ago I made a covenant with Him that I would devote nine tenths of all the profits which I might make from mining for a period of ten years to the Church as Tithing and that I would retain but one tenth of these profits for my own use. Inasmuch as I have not made a dolar in mining as yet and also seeing that I would get the credit on the tithing books for all such sums in case I were to make anyting from mining I have today in my prayers made a covenant to give all such sums for such purposes as the Presidency of the Church of some of the Apostles may direct instead of taking credit on tithing.
[Diary of Heber J. Grant, http://amzn.to/newmormonstudies]