Wherefore also it is contained in the scripture, Behold, I lay in Sion a chief corner stone, elect, precious: and he that believeth on him shall not be confounded.

This verse means that the scripture says there is a special, valuable stone placed in a place called Zion, and if you trust in that stone, you won't be confused or disappointed.

King James Version

Simple English

* Work in progress - there may be occasional inaccuracies