A private relationship of worshiping God is the greatest essential element of spiritual fitness. The time will come, as Nathanael experienced in this passage, that a private “fig-tree” life will no longer be possible. Everything will be out in the open, and you will find yourself to be of no value there if you have not been worshiping in everyday occasions in your own home. If your worship is right in your private relationship with God, then when He sets you free, you will be ready. It is in the unseen life, which only God saw, that you have become perfectly fit. And when the strain of the crisis comes, you can be relied upon by God.
Are you saying, “But I can’t be expected to live a sanctified life in my present circumstances; I have no time for prayer or Bible study right now; besides, my opportunity for battle hasn’t come yet, but when it does, of course I will be ready”? No, you will not. If you have not been worshiping in everyday occasions, when you get involved in God’s work, you will not only be useless yourself but also a hindrance to those around you.
God’s training ground, where the missionary weapons are found, is the hidden, personal, worshiping life of the saint.