止觀輔行傳弘決 3.35

3.35

禪滿相者，如螺髻仙人，名尚闍梨，有人畫像作僧形者非。得第四禪出入息斷，坐一樹下兀然不動。鳥見不動謂之為木，即於仙人髻中生卵。仙人定起，覺其頂上有於鳥卵，即自思惟：「我若起行，鳥母永不復來，鳥卵必壞。」即更入禪定，至鳥子飛去，爾乃起行。

As for the marks of the fulfillment of dhyāna: take, for example, the shell-coiled-topknot ṛṣi named Śāṅkarī—those who paint his image in the form of a monk are mistaken. Having attained the fourth dhyāna, his inhalation and exhalation were severed, and he sat beneath a tree motionless. A bird, seeing him motionless, took him for wood and laid eggs in the ṛṣi's topknot. When the ṛṣi emerged from absorption and noticed there were bird eggs on his head, he reflected: "If I get up and walk, the mother bird will never return, and the bird eggs will certainly be ruined." He immediately re-entered meditative absorption until the young birds flew away, and only then did he get up and walk.