Say not in grief "She is no more", but live in thankfulness that she was.
Variations and History:
Originally from poet Rabindranath Tagore. The quote in its full form can be seen below:
Say not in grief that she is no more,
but say in thankfulness that she was,
A death is not the extinguishing of a light,
but the putting out of the lamp,
because the dawn has come.
- Rabindranath Tagore