On the other hand, the salvation is to be wrought out by us. To have faith in the Son of God in exercise and prevalence; to have heart and life formed to childlike love of God, and to the fulfilment of His will; to carry this out against the flesh and the world and the devil,--all this is a great career of endeavour and attainment. It is much to make the discoveries implied in it: finding out at each stage the meaning of it, and how it should take shape. It is much to have the heart brought to beat true to it, to love it, consent to it, be set upon it. It is much to embody it in faithful and successful practice in the rough school of life, with its actual collision and conflict. Now the nature and working of God's grace at each stage is of this kind, that it operates in three ways at least. It operates as a _call_, an effectual call, setting a man on to arise and go. It operates also in a way of instruction, setting us to learn lessons, _teaching_ us how to live, as it is said in Titus ii. 11, 12. And it operates as a _power_, as help in time of need. He that sits still at the call--he that will not be considerate to learn the lesson--he that will not cast himself on the strength perfected in weakness, that he may fulfil and do the Father's will--he is a man who despises and denies the grace of God. * * * * * Now what has been said of the believer's relation to the saving God, prepares the way for referring to his office towards the world. Here the moral and practical theme which is in the Apostle's mind all through proves again to be in place: the lowly and loving mind will best discharge that office towards the world, which the arrogant and distempered mind would hinder. "Do all things without murmurings and disputings, that ye may be blameless and harmless."