Matthew 6:34

34. Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.

Spencer W. Kimball (Ch 1 Teachings of Presidents of the Church)

The Lord will not translate one's good hopes and desires and intentions into works. Each of us must do that for himself. (He changed his motto from "Do it" to "Do it now" to emphasize the importance of avoiding procrastination.)