Arthur James, first Earl of Balfour:
Our highest truths are but half-truths;
Think not to settle down forever in any truth.
Make use of it as a tent in which to pass a summer's night,
But build no house of it, or it will be your tomb.
When you first have an inkling of its insufficiency
And begin to descry a dim counter-truth looming up beyond,
Then weep not, but give thanks:
It is the Lord's voice whispering,
"Take up thy bed and walk."