Look not mournfully…

Look not mournfully
into the past,
it comes not back again.
Wisely improve the present,
it is thine.

Workplace Grief: 3 Keys to Help Coworkers and Yourself
Heartbreak Coaching New Trend: Become Better — Not Bitter!
A flat, monotonous plain is not for me
Teen Grief: Helping Your Teens through Grief