Here’s a concept 

Once or twice it has crossed your mind 

Or you’ve heard it mentioned 

by someone 

Somewhere 

If Today was your last day

Suddenly everything flashes before your eyes

You ponder all that has been and all that could....

It is said by William Penn:

I expect to pass through life but once. 

If therefore, there be any kindness I can show, or 

any good thing i can do to any fellow being, let me do it now and not defer or neglect it as I shall not pass this way again.