There are few historical records as explained, but his letter written on a scroll titled 'Furuichi harima hoshi Juko' (its byname is 'Kokoro no Shi no Bun' (literally, a writing of master on my mind)), which was given to his disciple Choin FURUICHI, is highly valued as a precious documentary record of that time.
このように史料は乏しいものの、弟子の古市澄胤に与えたという「古市播磨法師　珠光」と題された軸装の文書（通称「心の師の文」）は当時の貴重な文献として評価されている。