Sacred means valued due to involvement with holiness. Holiness, or sanctity, is generally the state of being holy or sacred. In other situations, “objects are frequently considered ‘holy’ or ‘sacred’ if used for spiritual purposes", such as the worship or service of gods.
These terms can also be employed in a non-religious or semi-religious context. It is often credited to people (“a holy man” of spiritual occupation, “holy prophet” who is respected by his followers), objects (“sacred object” that is venerated and blessed), times (“holy days” of spiritual introspection, such as in winter holidays), or places (“sacred ground”, “holy place”).