In the context this gains weight when one considers 10 - 12. Look at what the prophets did with their own prophecies. The text says they made careful search and inquiry. This is study, rational approach to the Word. It is thought, rational, like the first phrase in 13, "ready to learn."
It seems that the proper response to the magnitude of our redemption, at least to Peter, is to intentionally engage our minds to learn about our God in His Word.