We learn a valuable lesson from what the apostle Paul wrote to the Hebrew Christians. Some had not continued to grow spiritually; they had actually “gone back to needing milk, not solid [spiritual] food.” (Heb. 5:12) They had failed to keep up with the truth, which was being progressively revealed through the congregation. (Prov. 4:18) For example, many Jewish believers were still promoting the Mosaic Law even though some 30 years earlier the Law had been done away with on the basis of Christ’s sacrifice. (Titus 1:10) Anyone who has read Paul’s inspired letter to the Hebrews can confirm that this book contains solid spiritual food. It was just what those Christians needed to strengthen their faith in the superiority of the Christian arrangement for worship and to give them the courage to keep preaching.​—Heb. 10:19-23. w24.04 6 ¶15

Ever since Adam and Eve joined Satan and rebelled against Jehovah God, billions of humans have died. What lies ahead for all those people? A limited number, 144,000 in all, of Christ’s faithful followers will receive a resurrection to immortal life in heaven. (Rev. 14:1) And a vast number of faithful men and women who loved Jehovah will be part of the “resurrection of . . . the righteous,” and they will live forever on earth if they remain righteous during Christ’s Millennial Reign and during the final test. (Dan. 12:13; Heb. 12:1) Also during the Millennium, “the unrighteous”​—including those who never served Jehovah or who even “practiced vile things”—​will be given an opportunity to change their ways and become faithful. (John 5:29; Luke 23:42, 43) However, some humans were so wicked that he has decided that there will be no resurrection for them at all.​—Luke 12:4, 5. w24.05 2 ¶3; 5 ¶15; 6 ¶17

Someone who wants to be approved by Jehovah must be “speaking the truth in his heart.” (Ps. 15:2) This means more than not lying. Jehovah wants us to be honest through and through. (Heb. 13:18) That is important, “for Jehovah detests a devious person, but his close friendship is with the upright.” (Prov. 3:32) Those who ‘speak the truth in their heart’ do not pretend to be obedient in public while breaking God’s laws in secret. They avoid acting deviously. A devious person may begin to doubt the wisdom of some of Jehovah’s regulations. (Jas. 1:5-8) He may disobey Jehovah on matters that seem to him to be of little importance. Then if there appear to be no consequences for his disobedience, he may be emboldened to violate God’s laws further, and his worship would become hypocritical. (Eccl. 8:11) We, however, want to be honest in all things. w24.06 10 ¶7-8