STRONGS NT 2930a: κρυφαῖοςκρυφαῖος, κρυφαίᾳ, κρυφαιον (κρυφᾶ), hidden, secret: twice in Matthew 6:18 L T Tr WH. (Jeremiah 23:24; Wis. 17:3; in Greek writings from Aeschylus and Pindar down.)

Corresponding Greek / Hebrew Entries: • While there is no direct Hebrew equivalent for κρύσταλλος, the concept of clarity and purity can be related to Hebrew words such as זָכוּךְ (zakukh), meaning "pure" or "clear," and בָּרָק (barak), meaning "gleam" or "shine," which are used in the Old Testament to describe purity and brilliance.

Usage: The term κρύσταλλος is used in the New Testament to describe something that is clear and transparent, often in a metaphorical or visionary context.

Context: • The Greek word κρύσταλλος appears in the New Testament in the Book of Revelation. It is used to describe the clarity and purity of heavenly visions, emphasizing the divine and perfect nature of what is being depicted.
• In Revelation 4:6 (BSB), the term is used to describe the sea of glass before the throne of God: "Before the throne was something like a sea of glass, as clear as crystal." This imagery conveys the majesty and holiness of God's presence, suggesting a scene of serene beauty and perfection.
• In Revelation 22:1 (BSB), κρύσταλλος is used to describe the river of the water of life: "Then the angel showed me a river of the water of life, as clear as crystal, flowing from the throne of God and of the Lamb." Here, the crystal-clear river symbolizes the purity and life-giving nature of God's provision and the eternal life offered through Christ.
• The use of κρύσταλλος in these passages highlights the transcendence and purity associated with the divine realm, offering believers a glimpse of the perfection and holiness of God's kingdom.