Broughton Knox, formerly the principal of Moore Theological college… told his students, “God is not interested in one hundred percentism.”
There is a sense, of course, in which that is the only thing God is interested in. He wants us to trust and obey him wholly; he wants us to serve him with 100 percent loyalty. But then the focus is on him. What Broughton Knox meant is that very often what we call “one hundred percentism” is not unrestrained allegiance to God and his gospel but merely a reflection of a perfectionist personality. For some people, unless they tackle whatever they are doing with 100 percent of their energy and competence, the task is not worth doing at all. They cannot live with themselves unless they work that way. Frequently they are the high achievers. But from a Christian perspective, this attitude may turn out to be nothing more than another form of self-worship – in short, a form of idolatry.
In all our pursuit of excellence, we must never worship excellence. (p. 138-9)