by Spurgeon

Suppose you see a lake, and there are twenty or thirty streams
running from it: why, there won't be one strong river in the
whole area. There will be a number of little brooks which will
be dried up in the summer, and will be temporary torrents in
the winter. Every one of them will be useless for any great
purpose, because there is not enough water in the lake to feed
more than one great stream.

Now a man's heart has only enough life in it to pursue one
object fully. You must not give half of your love to Christ,
and the other half to the world.  No man can serve God and
money, because there is not enough in the heart to serve the two.