There is yet another stone wall which I will mention, namely, _firmness of character_. Our holy faith teaches a man to be decided in the cause of Christ, and to be resolute in getting rid of evil habits. "If thine eye offend thee"--wear a shade? No; "pluck it out." "If thine arm offend thee"--hang it in a sling? No; "cut it off and cast it from thee." True religion is very thorough in what it recommends. It says to us, "Touch not the unclean thing." But many persons are so idle in the ways of God that they have no mind of their own: evil companions tempt them, and they cannot say, "No." They need a stone wall made up of noes. Here are the stones "no, _no_, NO." Dare to be singular. Resolve to keep close to Christ. Make a stern determination to permit nothing in your life, however gainful or pleasurable, if it would dishonor the name of Jesus. Be dogmatically true, obstinately holy, immovably honest, desperately kind, fixedly upright. If God's grace sets up this hedge around you, even Satan will feel that he cannot get in, and will complain to God "hast thou not set a hedge about him?" I have kept you long enough looking over the wall, let me invite you in, and for a few minutes let us CONSIDER THE CONSEQUENCES OF A BROKEN-DOWN FENCE. To make short work of it, first, _the boundary has gone_. Those lines of separation which were kept up by the good principles which were instilled in him by religious habits, by a bold profession and by a firm resolve, have vanished, and now the question is, "Is he a Christian, or is he not?" The fence is so far gone that he does not know which is his Lord's property and which remains an open common: in fact, he does not know whether he himself is included in the Royal domain or left to be mere waste of the world's manor. This is for want of keeping up the fences. If that man had lived near to God, if he had walked in his integrity, if the Spirit of God had richly rested on him in all holy living and waiting upon God, he would have known where the boundary was, and he would have seen whether his land lay in the parish of All-saints, or in the region called No-man's-land, or in the district where Satan is the lord of the manor. I heard of a dear old saint the other day who, when she was near to death, was attacked by Satan, and, waving her finger at the enemy, in her gentle way, she routed him by saying, "Chosen! chosen! chosen!" She knew that she was chosen, and she remembered the text, "The Lord that hath chosen Jerusalem rebuke thee." When the wall stands in its integrity all round the field, we can resist the devil by bidding him leave the Lord's property alone. "Begone! Look somewhere else. I belong to Christ, not to you." To do this you must mend the hedges well so that there shall be a clear boundary line, and you can say, "Trespassers, beware!" Do not yield an inch to the enemy, but make the wall all the higher, the more he seeks to enter. O that this adversary may never find a gap to enter by!