Topical Studies for Proverbs 4:23:
Diligence {Forerunner Commentary}
Diligence {Nave's Topical Bible}
Diligence {Torrey's Topical Textbook}
Door {Nave's Topical Bible}
Guard {Forerunner Commentary}
Guard {Nave's Topical Bible}
Life {Forerunner Commentary}
Life {Nave's Topical Bible}
Mind {Forerunner Commentary}