David Livingstone is one of my favorite missionaries. Clearly he had an eternal perspective. On June 18, 1853 Livingstone wrote, "Our work and its fruits are cumulative. We work towards another state of things. Future missionaries will be rewarded by conversions for every sermon. We are their pioneers and helpers. Let them not forget the watchmen of the night, we how worked when all was gloom and no evidence of success in the way of conversion cheered our path."