In story after story, the message is that wisdom, truth, and understanding come only to those willing to give up something valuable in exchange.
Odin, the All-Father, is a Nordic god who willingly gave one of his eyes to the Well of Mimir in exchange for wisdom.
He gave up his outer sight so he could have insight.
He later hanged himself in Yggdrasil, the tree of life, for nine days and nine nights. He wanted wisdom so much he died for it.
The story of Odin teaches us that wisdom never comes free. There is always a price to pay, or a trade that we must make, to access it.