E-Wise: The Grateful Dead

First time when you get all out to help someone, they are grateful to you.


Second time, when you help them, they are a little less grateful to you.

And,

As you repeatedly help them, there comes a stage when they are outright ungrateful to you.

So, one should help people only under two circumstances - either when the person is dying or your are about to die if you dont help the person.