Our Christian lives ought to be based upon something like this: our having seen the Lord. We'll only go through if that is true. By the operation and activity of the Holy Spirit sent down from heaven, we must have an inward vision of the exalted Lord. For all endurance, and for all service, that is essential. Life that has to go on without that, is just a drag; it's an existence. Work or service without that inward vision has nothing in it to lift us, to carry us on. For everything it is indispensable - in life and work and endurance - we have this inward vision of the Lord in majesty and glory, kept fresh, kept clear, constantly revived. With such a vision all the essentials of effectiveness are bound up.