through the hypocrisy of men who speak lies, branded in their own conscience as with a hot iron;
These things Paul instructs Timothy to command and teach (verse 11). In order to do so successfully, he must live such a noble life that none will reject him or his teaching because of his youthfulness. Instead he is to become a model believer in his personal conversation, his conduct, his love for God and man, his faithfulness to God’s will, and his spotless moral purity (verse 12).