Thēsauros (G2344) means treasure, storehouse, treasury — the place where precious things are kept, and by extension, the precious things themselves. It appears 17 times in the New Testament. English derivatives include 'thesaurus' (a treasury of words). In the ancient world a thēsauros was both the container (treasure chest, vault) and the contents (valuable goods, wealth, resources).
Jesus uses thēsauros to redefine the nature of true wealth. In the Sermon on the Mount, he contrasts earthly treasures that 'moth and rust destroy' with heavenly treasures that endure (Matthew 6:19-21). The decisive statement follows: 'Where your treasure is, there your heart will be also' — what you treasure reveals and shapes your deepest loyalties.
Paul describes the gospel itself as a thēsauros: 'We have this treasure (thēsauron) in jars of clay, to show that the surpassing power belongs to God and not to us' (2 Corinthians 4:7). The treasure is the glorious gospel of Christ; the 'jars of clay' are fragile, unimpressive human ministers. And Colossians 2:3 locates all wisdom and knowledge as 'treasures' (thēsauroi) hidden in Christ — the inexhaustible wealth of knowing Jesus. True treasure is not accumulated but received, not hoarded but poured out.