1. The "holy place" of the Jewish tabernacle and temple.

Also applied to a sacred place or shrine in other temples and churches.

2. A private place; such as, an office or home, where one is free from intrusion.

Literally, "holy simplicity", an expression of astonishment at another person's naivety or naïvety (simple mindedness).

These are said to have been the dying words of John Huss (1373-1415), Bohemian religious reformer and martyr, provoked by the sight of a simple peasant adding wood to the fire around the stake where Huss was being martyred or burned to death for his religious beliefs.

1. In Judaism, the holy of holies; a sanctuary comprised of the innermost chamber of the Tabernacle in the temple of Solomon where the Ark of the Covenant was kept.
2. A person's private retreat, where he is free from intrusion; a place of utmost privacy.