An idiom to describe a brand with a long history, accumulation and foundation

The longer you experience it, the more steadfast it becomes.

As long as heaven and earth have existed. Describes a long time. It also describes something that never changes (mostly referring to love).

The source is far away and the flow is long. Metaphor has a long history.

Heaven and earth last forever, describing time being long. It also describes something that never changes (mostly referring to love). Same as "forever".

A hundred years, a thousand years. Describes the long years and lasts for a long time.

Pan Hao Mo Cang Pan Hai Mo Tian. The adjectives are broad and profound.

Insight into the background: hole: deep, thorough; know: know; background: the content of things. Thoroughly observe the content and inner circumstances of things.