The motive behind our words and actions is always critical to the success of leadership.
The idea of an ulterior motive indicates a hidden agenda that goes beyond the obvious or stated. The difficulty that often accompanies an ulterior motive is being able to prove the motive. We tend to make accusations about the motives of others because we assume, based on words and actions, the individual has a hidden agenda.
This may or may not be true. We cannot always know the motive of others, but we do know our own.
True spiritual leadership will demonstrate a transparency supported by the word of God. Therefore, we should lead others openly, promoting a pure and sincere motive.