取之不尽，用之不竭

Explanation: Exhaust: to do, finished. Take endless, with different. Described as very rich. 　　Usage: Complex sentence; as object clause; with compliment 　　Source: Su Song, "Red Cliff Dongpo _set_": "However, the river breeze, and the mountains of the moon, but for the ears was the sound of the event, becomes a target color, take the no ban, inexhaustible, the Creator The endless reservoir also. " 　　Examples: Water is not the ~, so we have to save water. 　　Results: In the salt lake 　　Postscript: In the salt lake Thesaurus:  timeless