στερεός

For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.

But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.

Whom resist stedfast in the faith, knowing that the same afflictions are accomplished in your brethren that are in the world.

Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from iniquity.