I can't understand what you're trying to imply. here are some possibilities that occur to me:

- surely in order to give energy one needs to have it to begin with, and ends up with less energy after giving it, so... that doesn't seem to lead to a sensible interpretation

- perhaps you're saying that one feels better after doing good, and so it shouldn't be a net drain. that seems sensible, but it misses the point that it still takes effort (AKA energy) to do good before it feels good, and if you don't have the energy to "invest", it's no use to know that you'd get plenty of "interest" on the investment, it just adds to the frustration