1 Corinthians 3:11 For no man can lay a foundation other than the one which is laid, which is Jesus Christ.
Christ needs to be our foundation. If we build on anything other than Him, we will collapse. Every kid in Sunday School has heard the story about the wise man building on the rock and foolish man building on the sand. When tough times come, the house on the sand falls down, but the house on the rock stands. He is our rock. All other foundations will collapse during the tough times.
He needs to be our cornerstone. The cornerstone is the most important stone in a building. Every other stone is laid off of that one, so that one is essential. If Christ is not the cornerstone of our lives, everything else will be off.