Job 28:15
"It cannot be gotten for gold, neither shall silver be weighed for the price thereof."
Cross References (ranked by relevance)
Proverbs 16:16
How much better is it to get wisdom than gold! and to get understanding rather to be chosen than silver!
Proverbs 8:19
My fruit is better than gold, yea, than fine gold; and my revenue than choice silver.
Job 28:18
No mention shall be made of coral, or of pearls: for the price of wisdom is above rubies.
Proverbs 8:17
I love them that love me; and those that seek me early shall find me.