"Providing mercy to those in need is often a challenging task. It involves giving of yourself. I think that Paul understood this, for he encouraged those who were providing care for others not to grow weary in doing good (Gal. 6:9)." Mercy Ministry is the subject of the December issue of Tabletalk and it is also the subject of Elliot Grudem's article from the magazine.
Though Scripture warns us against growing weary in doing good, Grudem warns, "we can quickly grow weary of doing good for a number of reasons." He offers three of those reasons. But to read them, you'll need to click through to Mercy Ministry.