We are not called upon as Christians to be, or to try to be, Christian in various respects. To be Christian, I say, is to possess a certain character and therefore to be a certain type of person. So often that is misinterpreted and people think that what the New Testament exhorts us to do is to try to be Christian in this and that respect, and to try to live as a Christian here and there. Not at all: we are Christians and our actions are the outcome of that.
– Martyn Lloyd-Jones, Studies in the Sermon on the Mount, p. 81