Back in September, I heard someone say that he lives his life always remembering, "The world is not yours to save but serve the One whose it is." Just today I found a guy from circa 450 BC who summed things up for me really well. His name was Malachi and he wrote about honoring God like a child would honor her mother or father. He links honor to worship, obediently listening and doing the right thing. In fact, he wrote that those who do not honor God are those who exploit workers, take advantage of widows and orphans and are inhospitable to the homeless.
So, my motivation ultimately boils down to honoring God. It's not a guilt-based kind of thing where I feel guilty if I don't honor Him. Instead, it's a love-based system. God has put a love in my heart (His Spirit) that motivates me to worship, obediently listen and do the right thing. It's this same love that prompts me to get mad and sad in the face of exploitation, profitization, hatred, prejudice and the like. Honoring God is caring about the things He cares about – the poor, the orphan, the widow, the homeless… I would rather spend my life on these people than on myself because I know that will honor the One I love the most.