A Christian is not a spirit. He is mind, body, and spirit - and the body, distinguishing him from other beings, is in fact the most essential element of his life on earth. Though treasures be stored in the spirit and in heaven, if the body be not holy, be not mighty and strong - equipped to fight, to take down the Persian elephant, the infantry, and the cavalry, the spirit's treasures will be taken, not only by demons, but by better men, who wage war for the Lord in love and in martyrdom.
The first and last fortress of a king is his body. The first to stand, the last to fall.