Stone

A natural material whose substance remains what it is regardless of how it is shaped or how fine it is ground. In the biblical symbol-system, stone represents truth as it is found in reality — unmanufactured, carrying its own integrity. The altar of uncut stone, the tablets of the commandments, Christ as the foundation stone — the same substance at different scales and purposes. Petros — a moveable stone or pebble. Petra — bedrock, the immoveable foundation. Same substance, different scale.

Synonyms: rock, petra, petros, foundation, sand, pebble, boulder, gravel.