宋高僧傳 30.14

30.14

系曰：草衣在南嶽炎方，壯年即可，未知衰老徙居幽朔耐否？如能，則上上根勝士也。

The appraisal says: 'Wearing grass clothing in the blazing southern regions of Nanyue may be fine in one's prime of life, but it is unknown whether one could endure it in frailty and old age if moved to the remote northern wastes. If one can, then one is a superior practitioner of the highest capacity.'