It is just as natural and easy for a Christian to live the Christian life as it is for a sinner to live a sinful life. The sinner needs make no effort to live a sinful life; he lives it naturally and easily. Life proceeds from the heart. The heart is the fountain, and the life is the stream. As the fountain is, so the stream will be. It is not difficult to live a Christian life when our hearts are pure. This is the secret of purity of life.

The important question, then, is, "How can I have a pure heart?" Hearts are made pure by the blood of Jesus. Then comes the command, "Keep thyself pure." That the heart may be kept pure, it must be kept filled with that which is pure. To keep darkness out of a room, we need only to keep it filled with light. Carefully closing up every crevice will not suffice if the light goes out. Darkness will be present. But simply keep the room filled with light, and no effort is required to keep darkness out. In like manner no effort need be made to keep impurity out of the heart and keep the heart filled with that which is pure.

But what is pure? "The word of God is pure, as silver tried in a furnace of fire, purified seven times." "Thy word is very pure; therefore thy servant loveth it." "Let the word of Christ dwell in you richly," and your heart will be kept pure. The Psalm-writer said, "Thy word have I hid in my heart, that I may not sin against thee." Here is the only way to a sinless life. Keep the heart filled with the Word of God. It is the way to live as the Bible reads. To have a nicely bound volume of the Scriptures lying on the center table will not keep the life sinless. We must have the Word in our heart. One night while I was waiting for a train in one of our large Eastern cities, I went into a mission. A man arose and said he had read the Bible through forty-two times and could quote whole books of it from memory. Later in his talk he said he committed sin more or less every day. The Word of God did not keep him from sinning, for he had it in his head instead of in his heart.

To live a Bible life is the only true and right way to live, and in order to live such a life, we need to have the Word written in the heart. "I will put my laws into their mind, and write them in their hearts." Heb.8: 10. Let us illustrate this by taking a single text: "Having food and raiment let us be therewith content." When we have these words in the heart, they will be true in the life. All fret and worry and murmurings will be banished out of the life when the heart is full of the truth.