"Be courageous concerning this, O Christian! be not dispirited, as though your spiritual enemies could never be destroyed. You are able to overcome them—not in your own strength—the weakest of them would be too much for you in that; but you can and shall overcome them through the blood of the Lamb. Do not ask, "How shall I dispossess them, for they are greater and mightier than I?" but go to the strong for strength, wait humbly upon God, and the mighty God of Jacob will surely come to the rescue, and you shall sing of victory through his grace."
Taken from Spurgeon's Morning & Evening Devotions