There is a quote that is often used in motivational speaking that says, "The definition of insanity is doing the same thing over and over again and expecting different results." The point of this quote is to recognize that the way things work out in various areas of our lives are often a direct result of what we do in those areas. If we keep doing something the same exact way, the results will probably be pretty much the same. If we want the results to change, then we need to change what we do.
Perhaps the Jaredite civilization would have survived if they had only known this definition of insanity.
In Ether 15, the last of the Jaredites are divided into two groups with everyone — men, women, and children — included as part of one army or the other. The two sides go to war and, after a fierce day of fighting, each side suffers many deaths. In each camp, the night is filled with "a howling and a lamentation for the loss of the slain of their people; and so great were their cries, their howlings and lamentations, that they did rend the air exceedingly" (verse 16).
After this horrific night, the people go out the next day and…do the exact same thing. Again, many people are killed on each side, and another night of howling and lamentation is spent. The cycle is repeated the next day and the next, over and over again, until eventually everyone is dead and the Jaredite civilization is no more.