Nothing is promised. We don't know how many tomorrows we may have. I am a firm believer of living each day as if it were your last especially in regards if how you treat others. How do you want to be remembered? Were you kind to those around you. Will people have fond memories of you?
Don't wait until tomorrow to tell someone how important they are to you. Don't wait until tomorrow how beautiful their smile is. Don't wait to let those you love really and truly know it, without a shadow of a doubt.
We don't know how long WE have and we certainly don't know how long anyone else has either. What if your interaction with a person was their last? Did you pass on love or anger? Kindness or rudeness? Generosity or selfishness. Leave your input on people's hearts in a positive way, because we just never know.