God’s solid foundation never crumbles or caves in.
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. Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner, And a stone of stumbling, and a rock of offence, even to them which stumble at the word, being disobedient: whereunto also they were appointed. (1 Peter 2:6-8 KJV)
God is solid foundation on which to build a successful spiritual life in this world. Any man who chooses to turn to God in faith setting their life in His hands is established upon solid ground. God is a precious foundation that never fails or crumbles even as the world falls apart and caves in around them. God is a stalwart basis upon which to erect a life of eternal purpose which will remain standing in this world and for all eternity with Him at the helm.
However, to those who seek to build on an alternate foundation such as their own works, traditions of man, the occult, or other false premise from the god of this world; the Chief Corner Stone is a spiritual stumbling block. God is a rock who truths naturally offend and confound those who choose to trust in a premise built on a faulty pattern of the god of this world rather than upon His sturdy and eternal premise.