failure to pray will eventually lead to destruction (Brigham Young)
Those who think that they can succeed without praying, try it, and I will promise them eternal destruction, if they persist in that course. Some think that they can prosper by lying a little, breaking the Sabbath, and doing almost everything that they ought not to do. In the end they will learn that they have trod the path that leads to the first and second death, which will have power over them; and the time will come when they will be as though they had not been.
Brigham Young, Journal of Discourses 7:205