Christians have so many true riches to enjoy that it is sad when many try hard to accumulate the uncertain riches of this world. "Lay not up for yourselves treasures upon earth," said Jesus (Matthew 6:19).
For example, Paul speaks of "the riches of his goodness and forbearance and longsuffering" (Romans 2:4) which have led Him to provide our eternal salvation. For those who have been saved, he writes of "the riches of his glory on the vessels of mercy, which he had afore prepared unto glory" (9:23). Then, in contemplating the great plan of God for both Jews and Gentiles, he exclaimed, "O the depth of the riches both of the wisdom and knowledge of God!" (11:33). In Him, in fact, are "hid all the treasures of wisdom and knowledge" (Colossians 2:3).
When he wrote to the Ephesian Christians, Paul reminded them that Christ had redeemed them through His blood and forgiven their sins "according to the riches of his grace," in hope that they would understand "the riches of the glory of his inheritance in the saints." He told them that "God, who is rich in mercy," had saved them in order "that in the ages to come he might shew the exceeding riches of his grace in his kindness toward us through Christ Jesus" (Ephesians 1:7, 18; 2:4, 7).
Finally, summarizing all these true riches--mercy, glory, grace, goodness, wisdom, knowledge--Paul spoke of "the unsearchable riches of Christ" (Ephesians 3:8). "Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him" (1 Corinthians 2:9). HMM