How should we respond when we are discouraged in doing good?

The Lord has planned good deeds for us to do.

Sometimes, no matter how hard we try, certain situations are beyond our help.

At other times, even though we help someone, and the person gains from our assistance, the person may turn out to be ungrateful and even backstabbing.
The person may have counted our offences against us, more than our willingness to help in the situation.
The person may also feel a false sense of accomplishment and pride at the achievements, as though the person is "self-made".

You know that whatever good deeds we do, we do it as unto the Lord, not counting the possible gratitude and rewards in this life, but with a heart of pure goodness to exclaim the glory of God.
Even so, we do feel disappointed, don't we?

Whatever it is, I encourage you not to give up doing good (not necessarily always to the same person), because you will reap the harvest in the long run, if you do not give up.

Besides, it is not about the others and you.

It is strictly between God and you.