Christ may be called the key-stone of the arch of truth. Take away the key-stone of an arch, and the whole becomes a heap of rubbish. The very same stones may be there, but they are all fallen, smothered, and confused, without order, without end. Just so, take Christ away, and the whole arch of truth becomes a heap of rubbish. The very same truths may be there; but they are all fallen, without coherence, without order, without end. Christ may be called the sun of the of the system of truth. Take away the sun out of our system, and every planet would rush into confusion … Just so, take Christ away, and the whole system of truth rushes into confusion.
– Robert Murray M’Cheyne –