Life requires energy. Life requires a new day- a goal- an opportunity to express to share adventure- to meet new acquaintance or to share positive feeling sand experience. When we are alive in the hope of all that is good or all that is God, we look forward.
V 15.... "When the morning arose".... a new day... God gives us a new chance with each new day
"the angels hastened"..... the angels quickened their activity to do good.
"arise" do not linger here in your grief ... do not be consumed in your iniquity
v. 16 And while he lingered... " Lot and his family lingered in Sodom... in their bad habits.. in their sadness for loss of friends and family. They all held back and needed someone to "lay hold upon (his) hand" and help them. The Lord's mercy helped them do what they could not do for themselves. It moved them to a new and safe place.
v. 17. "Look not behind thee." instruction for us all - I believe it means we are not to dwell on it to the point where it becomes a place of escape from reality and keeps us from doing what is needed to survive.
"escape thou to the mountain" ... put away your old habits of iniquity... the ones that have bound you. Put away the desires that keep you here and prevent you from moving to higher ground.
Although "escape thou to the mountain" is a literal phrase used to move Lot and his family away from the certain destruction, it also means that we have to raise our spiritual selves up to where we are safe from the lowly habits of the world. The mountain is where we may find the Lord and his goodness -the mercy of the Lord removed Lot's family to higher ground when they would were mired in habits that kept them on the lowly plain.
What could God's mercy do for me in my time of lingering? in my time of remorse or regret?
Where could God's mercy and grace take me if I would accept his leading hand?
"We will not dwell on the past nor will we shut the door on it."