Does being right always matter?

{“Kindness is a/the language the deaf can hear and the blind can see.”  ~ Mark Twain}

I don't know if Twain really said this or not, but my experience with the source of this info makes me automatically question it's validity. Does it matter? Do I need to spend 15+ minutes searching for the answer but does it matter? 

It's not like the quotation contains "fact" that might be detrimental if found to be wrong. It's not like someone else is losing copyright profits by Twain getting credit. Anyone could have said it first. Maybe the first person to put those words together in that order unwitting gave the credit to Twain thinking it was something he said. 

Trying to always be "right" is exhausting...