四明十義書 1.17

1.17

況上人自立事法二種觀心，唯有二意：一為令已修止觀者，覩事相法相不忘本習，故示二種觀心也。二為未修止觀者，忘於封滯，令知起行必依止觀，故示二種觀心也。

Moreover, you yourself establish that the two kinds of contemplation of the mind—phenomenal and doctrinal—have only two purposes: first, to cause those who have already cultivated calming and contemplation not to forget their original training when observing phenomenal and doctrinal characteristics; hence the two kinds of contemplation of the mind are shown. Second, to cause those who have not cultivated calming and contemplation to abandon their rigid attachments and know that initiating practice must rely on calming and contemplation; hence the two kinds of contemplation of the mind are shown.