This next quote comes from a letter from Andrew Fuller to John Ryland dated April 2, 1795. It can be found in Michael A. G. Haykin’s, The Armies of the Lamb: The Spirituality of Andrew Fuller (Dundas, ON: Joshua Press, 2001), p. 133.
… Sin is to be overcome, not so much by maintaining a direct opposition to it, as by cultivating opposite principles. Would you kill the weeds in your garden, plant it with good seed; if the ground be well occupied, there will be less need of the labour of the hoe. If a man wished to quench fire, he might fight it with his hands till he was burnt to death; the only way is to apply an opposite element.