Both motives are Christian and coexist side by side with no conflict.
Because the Bible does? Hebrews 12:2 has been mentioned before, I believe. Naked self-interest without the modifier certainly denotes or at least connotes selfishness, but we were using a participial adjective with it. Please acquaint yourself with the term enlightened self-interest and its relationship to love. They are not mutually exclusive, as I have already demonstrated.