What is Scripture?

De Lubac ( Medieval Exegesis: The Four Senses of Scripture, Vol. 1 ) answers with a catena of quotations from the church fathers:

“Scripture is like the world: ‘undecipherable in its fullness and in the multiplicity of its meanings.’ A deep forest, with innumerable branches, ‘an infinite forest of meanings’: the more one gets into it, the more one discovers that it is impossible to explore it right to the end. It is a table arranged by Wisdom, laden with food, where the unfathomable divinity of the Savior is itself offered as nourishment to all. Treasure of the Holy Spirit, whose riches are as infinite as himself. True labyrinth. Deep heavens, unfathomable abyss. Vast sea, where there is endless voyaging, ‘with all sails set.’ Ocean of mystery.”