This meaning refers to specialized or advanced techniques that are often closely guarded within a particular field or discipline. They typically represent a deeper understanding or mastery of the art.

This meaning suggests that there are profound, hidden truths or knowledge that are not easily accessible. It implies an element of spirituality or deep understanding related to life or art.

In this context, it denotes the fundamental nature or most important quality of something, capturing its true character or essence.

This meaning refers to the purest or most concentrated form of something, often embodying its ultimate nature or significance.

This usage indicates the core or most vital aspect of something, often represented as the emotional or spiritual center.