Thanks

There is nothing as sweet and fulfilling as a sincere "thank you".  

There's an idea that reciprocity always has to be expressed in the form of a "trade-off" where the value of the  reciprocated gift should match the value of the initial offering.  What's interesting is that anthropological analysis has considered this process, in some respects, as very business-like, but you could take an anthropology class and see that for yourself. 

But a sincere thank you... such a beautiful expression.  I can't properly describe. 

I guess one has to come from a place where the kindness shown isn't at all deserved.