1 Peter 1:13 in the King James Version
Wherefore gird up the loins of your mind, be sober, and hope to the end for the grace that is to be brought unto you at the revelation of Jesus Christ;
Context
12 To them it was revealed that they served not themselves, but you, in these things, which now have been announced to you through those who preached the Good News to you by the Holy Spirit sent out from heaven; which things angels desire to look into.
13 Therefore prepare your minds for action. Be sober, and set your hope fully on the grace that will be brought to you at the revelation of Jesus Christ—
14 as children of obedience, not conforming yourselves according to your former lusts as in your ignorance,