" We all know that logs float and stones sink. But if you lash several logs together and then put the stones on top of the logs, you can get both the logs and stones across the river. If you try lashing the stones together and putting the logs on top, the stones will sink and the logs will scatter, and nothing will get across the river. You always float stones on logs, not the other way around. In the same way, we need to “float” “B” doctrines on top of “A” doctrines. Every culture (including our own) can readily grasp part of the truth but not all of it. "

― Timothy J. Keller , Center Church: Doing Balanced, Gospel-Centered Ministry in Your City