The other condition of growth is exercise. Use the grace which you have, and it increases. Practice the truth which you know, and many things will become clearer. The blacksmith's muscles are strengthened by wielding the forge-hammer, but unused they waste. The child grows by exercise. To him that hath--truly possesses with that possession which only use secures--shall be given.
Communion with Christ, including prayer, and exercise are the means of growth.
IV. Lastly, observe the solemn alternative to growth.
It is not a question of either growing or not growing, and there an end; but if you will look at the context you will see that the exhortation of my text comes in in a very significant connection. 'Behold! beware, lest being led away ... ye fall from your own steadfastness.' 'But grow in grace.' That is to say, the only preventive of falling away from steadfastness is continual progress. The alternative of advance is retrogression. There is no standing still upon the inclined plane. If you are not going up, gravity begins to act, and down you go. There must either be continual advance or there will be certain decay and corruption. As soon as growth ceases in this physiology _disintegration_ commences. Just as the graces exercised are strengthened, so the graces unexercised decay. The slothful servant wraps his talent in a napkin, and buries it in the ground. He may try to persuade his Master and himself with 'There Thou hast that is Thine'; but He will not take up what you buried. Rust and verdigris will have done their work upon the coin; the inscription will be obliterated and the image will be marred. You cannot bury your Christian grace in indolence without diminishing it. It will be like a bit of ice wrapped in a cloth and left in the sun, it will all have gone into water when you come to take it out. And the truth that you do _not_ live by, whose relations and large harmonies and controlling power are not being increasingly realised in your lives; that truth is becoming less and less real, more and more shadowy, and ghostlike to you. Truth which is not growing is becoming fossilised. 'The things most surely believed' are often the things which have least power. Unquestioned truth too often lies 'bedridden in the dormitory of the soul side by side with exploded error.' The sure way to reduce your knowledge of Jesus Christ to that inert condition is to neglect increasing it and applying it to your daily life. There are men, in all churches, and there are some whole communions whose creeds are the most orthodox, and also utterly useless, and as near as possible nonentities, simply because the creed is accepted and shelved. If your belief is to be of any use to you, or to be held by you in the face of temptations to abandon it, you must keep it fresh, and oxygenated, so to say, by continual fresh apprehension of it and closer application of it to conduct. As soon as the stream stands, it stagnates; and the very manna from God will breed worms and stink. And Christian truth unpractised by those who hold it, corrupts itself and corrupts them.
So Peter tells us that the alternative is growth or apostasy. This decay may be most real and unsuspected. There are many, many professing Christians all ignorant that, like the Jewish giant of old, their strength is gone from them, and the Spirit of God departed. My brother, I beseech you, rouse yourself from your contented slothfulness. Do not be satisfied with merely having come within the Temple. Count nothing as won whilst anything remains to be won. There is a whole ocean of boundless grace and truth rolling shoreless there before you. Do not content yourselves with picking up a few shells on the beach, but launch out into the deep, and learn to know more and more of the grace and truth and beauty of your Saviour and your God.