Taken from "Crazy Love" by Francis Chan

"For years I gave God leftovers and felt no shame. I simply took my eyes off Scripture and instead compared myself to others. The bones I threw at God has more meat on them than the bones others threw, so I figured I was doing fine.
It is easy to fill overselves up with other things (even ministry) and then give God whatever is left. Hosea 13:6 says, "When I fed them, they were satisfied: when they were satisfied they became proud; then they forgot me." God gets a scrap or two only because we feel guilty for giving Him nothing, a mumbled three-minute prayer at the end of the day, when we are already half asleep. Two crumpled-up dollar bills thrown as an afterthought in to the church's fun for the poor. Fetch God!
"But when you present the blind for sacrifice, is it no evil? And when you present the lam and sick, is it not evil? Why not offer it to your governor? Would be be pleased with you? Or would he receive you kindly" says the Lord-Malachi 1:8.
The priests of Malachi's day thought their sacrifices were sufficient. They had spotless animals but chose to keep those for themsleves and give their less desirable animals to God. They assumed God was pleased because they had sacrificed something.
God described this practice as evil.
Leftovers are not merely inadequate from God's point of view (and least we forget, His is the only one who matters), they are evil. Let's stop calling it "a busy schedule" or "bills" or "forgetfulness." It's called evil.
God is holy. In heaven exists a Being who decides whether or not I take another breath. This holy God deserves excellence, the very best I have."