When we serve each other, we serve the Highest in us, as us and through us. When we serve others without expectations of a reward of any type, this is seva, and in these actions, we are transformed. 

Seva is a training ground for learning to act without desire for a particular result, which will keep us in a state of equaniminity inside, no matter what is happening around us. The more seva we practice, the better we get at performing our routine daily actions without getting attached to what we create with those actions - it is truly giving with "no strings attached." 

"Selfless dedication will serve you.  Do not ever think you are
performing seva for others. It is for you, for you!"  ~ Sai Maa