Razan was greatly influenced both spiritually and academically by his encounter with Seika, and Seika was surprised by Razan's brilliance and introduced Razan to Ieyasu TOKUGAWA in the following year, 1605.
羅山にとって惺窩との出会いは、精神的、学問的に大きく影響を受けることになり、惺窩も羅山の英明さに驚き、翌年の1605年には徳川家康に会わせる。