All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness.—2 Timothy 3:16 JNN 231.1
I have been shown that those who have a knowledge of the truth, and yet allow all their powers to be absorbed in worldly interests, are unfaithful. They are not, by their good works, letting the light of truth shine to others. Nearly all their ability is devoted to becoming sharp, skillful men of the world. They forget that their talents were given them of God to be used in advancing His cause. If they were faithful to their duty, the result would be great gain of souls to the Master, but many are lost through their neglect. God calls upon those who know His will to be doers of His word. Weakness, half-heartedness, and indecision provoke the assaults of Satan; and those who permit these traits to grow will be borne helplessly down by the surging waves of temptation. Everyone who professes the name of Christ is required to grow up to the full stature of Christ, the Christian’s living head. JNN 231.2
We all need a guide through the many strait places in life as much as the sailor needs a pilot over the sandy bar or up the rocky river, and where is this guide to be found? We point you, dear brethren, to the Bible. Inspired of God, written by holy men, it points out with great clearness and precision the duties of both old and young. It elevates the mind, softens the heart, and imparts gladness and holy joy to the spirit. The Bible presents a perfect standard of character; it is an infallible guide under all circumstances, even to the end of the journey of life. Take it as the person of your counsel, the rule of your daily life. JNN 231.3
Every means of grace should be diligently improved that the love of God may abound in the soul more and more, “that ye may approve things that are excellent; that ye may be sincere and without offense till the day of Christ; being filled with the fruits of righteousness.” Your Christian life must take on vigorous and stalwart forms. You can attain to the high standard set before you in the Scriptures, and you must if you would be children of God. You cannot stand still; you must either advance or retrograde. You must have spiritual knowledge, that ... you may “be filled with all the fullness of God.”—Testimonies for the Church 5:263, 264. JNN 231.4
Further Reflection: If weakness, half-heartedness, and indecision attract the assaults of Satan, what do I need to change in my life to withstand Satan’s devices? JNN 231.5