The word fast, in this sense, is a form of “fastened” or fixed. It means to be both unmoved (voluntary) and unmovable (involuntary) as we weather the trials of life. Only through the power of God may both be accomplished.

“Watch ye, stand fast in the faith, quit you like men, be strong.” ‭‭(1 Corinthians‬ ‭16:13‬)

God’s Word changes lives.