He commended his very praiseworthy and gallant resolution, but admonished him to proceed with greater caution in encountering dangers, because his life did not belong to him, but to all those who had need of him to protect and aid them in their misfortunes.
There are no more uses of "admonish" in the book.
Show samples from other sources
He admonished the child for his bad behavior
"Harald asks the questions here," a man’s gruff voice admonished.
Katherine Applegate -- Everworld - Search For Senna