Second, from verse 5 we consider the forward look to God's final victory and the Elijah who prepares the way. Third from verse 6 we consider the effect of God's word on the relationships between fathers and children. Maybe the best way to bring out the sense of this command is to look at some analogies. Because the memory will can save them from a similar fate. There are many people who have been taken by the hand and brought out of the city of destruction, who then look back with ungrateful longing for the ways of sin and in that moment are hardened like a pillar of salt.
Memory is a means of salvation.
You may remember the story of the Texas Revolution. In December 1835 the Texas revolutionaries took the town of San Antonio. The fortress there was called the Alamo and was guarded by 150 men when Santa Anna, with Mexican forces came against the town on February 26 the next year. With 32 reinforcements the Texans held off the enemy until March 6 when the siege ended in bloody hand to hand combat and every Texan was dead including Jim Bowie and Davy Crocket. Because the past exerts power in the present through the gift of memory.