Topical Studies for Proverbs 4:23:
Diligence {Forerunner Commentary}
Diligence {Nave's Topical Bible}
Diligence {Torrey's Topical Textbook}
Heart {Forerunner Commentary}
Heart {Nave's Topical Bible}
Life {Forerunner Commentary}
Life {Nave's Topical Bible}
Keep {Forerunner Commentary}