He also made a psychological reform of his retainers and people through the use of "Sanshi Kyokunjo" (Moral Principles for Motonari's Three Sons) and the slogan "Hyakuman Isshin" (Everything is possible if the people are united).
三子教訓状や百万一心などの標語による家臣領民の心理的な変革も含まれていた。