I remember reading this poem in an Ann Landers column when I was in my teens. Just as true now as it was then and it is how I try to approach showing others they matter to me. I've found no copyright, so author is still unknown.
If You're Ever Going To Love Me
If you're ever going to love me
love me now, while I can know
All the sweet and tender feeling
which from real affection flow.
Love me now, while I am living;
do not wait till I am gone
And then chisel it in marble--
warm love words on ice-cold stone.
If you've dear, sweet thought of me,
why not whisper them to me?
Don't you know 'twould make me happy
and as glad as glad could be?
If you wait till I am sleeping,
ne'er to waken here again,
There'll be walls of earth between us
and I couldn't hear you then.
If you knew someone was thirsting
for a drop of water sweet
Would you be slow to bring it?
Would you step with laggard feet?
There are tender hearts all round us
who are thirsting for our love;
Why withhold from them what nature
makes them crave all else above?
I won't need your kind caresses
when the grass grows o'er my face;
I won't crave your love or kisses
in my last low resting place.
So, then, if you love me any,
if it's but a little bit,
Let me know it now while living;
I can own and treasure it.
(Author Unknown, though many have claimed authorship)