Finally, someone agrees with my method of learning/teaching

“What that message is can be made clear, as is the case with all definition, only by way of exculsion, by way of contrast. In setting forth the current liberalism, now almost dominant in the Church, over against Christianity, we are animated, therefore, by no merely neagtive or polemic purpose; on the contrary, by showing what Christianity is not we hope to be able to show what Christianity is, in order that men may be led to turn from the weak and beggarly elements and have recourse again to the grace of God.”

-J. Gresham Machen : Christianity and Liberalism

understanding by way of contrast. exactly. John Robbins tends to have the same approach, and I greatly appreciate it.