From Jennifer at "Et tu?" (the diary of a former atheist) [boldface mine]:
. . . Without God -- or, to phrase it another way, without objective truth -- we are sailors without a compass, trying to rely on gut instinct to navigate troubled waters. It might work out some of the time, as is evidenced by the number of nonbelievers who are indeed "good people" most of the time. But it leaves us vulnerable to the legion forces that try to steer us off course, and it makes it almost impossible to weather a great storm. If we don't know the truth about who we are, why we're here, where we came from and where we're going, we're on shaky ground to begin with; and when we deny the existence of objective truth on matters of what is good and bad, what is right or wrong, we lose control of our own lives. The further we get away from the truth, the closer we get to becoming slaves of those ever-present, soul-killing voices, with names like Lust and Greed and Power and Selfishness and Status, that whisper in our ears, "It's OK, just do it. There's nothing wrong with that."
When I was an atheist, I thought I was more liberated than the people who believed in God. After all, I didn't have all their bizarre rules and regulations to bog me down. Now I realize that those "rules" that seemed so bizarre are actually a tool set, a key to unlock the shackles of sin, a compass and chart to navigate the troubled waters we all find ourselves in. Now I realize not only where that inscription came from, but what it means. To know God is to know the truth. And without the truth, we can never be free.
Read it all.