A hotel room costs money; it also costs to leave things on your mind. Getting a single room is costly enough, what if you had to pay for a dozen rooms? Your most basic "nice" hotel is around $35 a night, name-brand hotels can cost around $100 a night. You do the math at taking on a dozen rooms, it can get expensive.
That same expense is what it may be like with you when you bring "yesterday" and it's components, into today. If you bring with you a dozen worries, it is going to cost you. This cost can eat at you daily. What if you bring with you things from the past, not just one night, but say the last three months it's been "renting a room" in your mind. WOW...that is going to get expensive!
As you think about the weight and cost of "yesterday" read the following quote...
Finish each day and be done with it. You have done what you could; some
blunders and absurdities have crept in; forget them as soon as you can.
Tomorrow is a new day; you shall begin it serenely and with too high a spirit to
be encumbered with your old nonsense. ~Ralph Waldo Emerson
There are probably some exceptions, but think to yourself about all the time and energy that you've wasted allowing things to take up space in your mind that happened "yesterday". When we keep bringing with us things from yesterday into today, or worse, things from days ago, it keeps us consumed with using energy to keep it around.
If we would just learn to let the "yesterday" be exactly that. Carry as few things into the next day as possible. Don't even bring "tomorrow" into today, as that takes unneeded effort. Let us let today be the day we take advantage of and put our energies into.
Let the past dissolve, be excitedly patient about tomorrow, but use your energy to make today the day that you be you.
Use this day to it's fullest!