yasya sthairya-gatani hi
sa eva dhairyam apnoti
hrsikese—to the master of the senses; hrsikani—all the senses; yasya—whose; sthairya-gatani—fixed; hi—certainly; sah—that person; eva—of course; dhairyam apnoti—attains the position of dhairya, endurance; samsare—in the material world; jiva-cancale—where everyone is disturbed.
"In this material world, all living entities are disturbed due to their flickering position. A devotee, however, is fixed in the service of the lotus feet of the Lord, the master of the senses. Such a person is to be considered situated in endurance and patience.
Link to this page: https://prabhupadabooks.com/cc/madhya/24/184