Joseph B. Wirthlin taught,

“The natural consequence that comes to those who depart from the way of the Lord is that they are left to their own strength. While in the heat of our success we might assume that our own strength is sufficient, those who rely upon the arm of the flesh soon discover how weak and unreliable it truly is.”

“Journey To Higher Ground”
October 2005 General Conference
See Also Helaman 4:13