This is a couplet on the stone pillar of Canglang Pavilion, a famous garden in the Song Dynasty.
This couplet is a collection of quotations, the upper part of which is taken from Ouyang Xiu's Canglang Pavilion, and the lower part is taken from Su Shunqin's A Trip to Suzhou.
It means: the breeze and bright moon should be priceless, and sometimes no amount of money can buy it; The nearby water and the distant mountains seem to be very spiritual, deliberately forming a beautiful landscape picture.