Warren Wiersbe emphasizes the secret of Christian joy as believing and acting upon God's Word, highlighting that faith not rooted in the Word is mere presumption or superstition, and joy not stemming from faith is fleeting. He encourages rejoicing in the Word like finding hidden treasures, stressing the importance of delighting in and diligently studying God's Word to uncover its riches. Wiersbe challenges believers to assess if they truly value God's Word above all else, comparing it to food, sleep, or wealth, and prompts them to love and meditate on the Word consistently for guidance and illumination.

The secret of Christian joy is to believe what God says in His Word and act upon it. Faith that isn’t based on the Word is not faith at all; it is presumption or superstition. Joy that isn’t the result of faith is not joy at all; it is only a “good feeling” that will soon disappear. Faith based on the Word will produce joy that will weather the storms of life. It isn’t enough for us to read the Word or receive the Word as others expound it; we must also rejoice in the Word. “I rejoice at Your word as one who finds great treasure” (Ps. 119:162). In Bible days, people sometimes hid their wealth in jars buried in the ground (Matt. 13:44; Jer. 41:8). If a farmer plowing his field suddenly discovered a jar filled with gold, he would certainly rejoice. There are great treasures buried in God’s Word, and you and I must diligently “dig” for them as we read, meditate, and pray; and when we find these treasures, we should rejoice and give thanks. If we read and study the Word of God only from a sense of duty, then its treasures may never be revealed to us. It is the believer who rejoices in the Word, who delights to read and study it day by day, who will find God’s hidden treasures. “Blessed is the man who fears the Lord, who finds great delight in his commands” (Ps. 112:1, niv). “But his delight is in the law of the Lord, and in His law he meditates day and night” (Ps. 1:2). Do you delight in God’s Word? Would you rather have God’s Word than food (Ps. 119:103; Luke 10:38–42), or sleep (Ps. 119:55, 62, 147–148), or wealth (vv. 14, 72, 137, 162)? True of you? "Oh, how I love Your law! I meditate on it all day long. . . . Your word is a lamp to my feet and a light for my path" (Psalm 119:97, 105, niv).