The first thing I proposed to myself was, to throw down my enclosures, and turn all my tame cattle wild into the woods, lest the enemy should find them, and then frequent the island in prospect of the same or the like booty: then the simple thing of digging up my two corn-fields, lest they should find such a grain there, and still be prompted to frequent the island: then to demolish my bower and tent, that they might not see any vestiges of habitation, and be prompted to look farther, in order to find out the persons inhabiting.
These were the subject of the first night's cogitations after I was come home again, while the apprehensions which had so overrun my mind were fresh upon me, and my head was full of vapours.

Thus, fear of danger is ten thousand times more terrifying than danger itself, when apparent to the eyes; and we find the burden of anxiety greater, by much, than the evil which we are anxious about: and what was worse than all this, I had not that relief in this trouble that from the resignation I used to practise I hoped to have.

I looked, I thought, like Saul, who complained not only that the Philistines were upon him, but that God had forsaken him; for I did not now take due ways to compose my mind, by crying to God in my distress, and resting upon His providence, as I had done before, for my defence and deliverance; which, if I had done, I had at least been more cheerfully supported under this new surprise, and perhaps carried through it with more resolution.
This confusion of my thoughts kept me awake all night; but in the morning I fell asleep; and having, by the amusement of my mind, been as it were tired, and my spirits exhausted, I slept very soundly, and waked much better composed than I had ever been before.

And now I began to think sedately; and, upon debate with myself, I concluded that this island (which was so exceedingly pleasant, fruitful, and no farther from the mainland than as I had seen) was not so entirely abandoned as I might imagine; that although there were no stated inhabitants who lived on the spot, yet that there might sometimes come boats off from the shore, who, either with design, or perhaps never but when they were driven by cross winds, might come to this place; that I had lived there fifteen years now and had not met with the least shadow or figure of any people yet; and that, if at any time they should be driven here, it was probable they went away again as soon as ever they could, seeing they had never thought fit to fix here upon any occasion; that the most I could suggest any danger from was from any casual accidental landing of straggling people from the main, who, as it was likely, if they were driven hither, were here against their wills, so they made no stay here, but went off again with all possible speed; seldom staying one night on shore, lest they should not have the help of the tides and daylight back again; and that, therefore, I had nothing to do but to consider of some safe retreat, in case I should see any savages land upon the spot.
Now, I began sorely to repent that I had dug my cave so large as to bring a door through again, which door, as I said, came out beyond where my fortification joined to the rock: upon maturely considering this, therefore, I resolved to draw me a second fortification, in the manner of a semicircle, at a distance from my wall, just where I had planted a double row of trees about twelve years before, of which I made mention: these trees having been planted so thick before, they wanted but few piles to be driven between them, that they might be thicker and stronger, and my wall would be soon finished.

So that I had now a double wall; and my outer wall was thickened with pieces of timber, old cables, and everything I could think of, to make it strong; having in it seven little holes, about as big as I might put my arm out at.