摩訶止觀 4.107

4.107

若深山遠谷，途路艱險，永絕人蹤，誰相惱亂？恣意禪觀，念念在道，毀譽不起，是處最勝。

As for deep mountains and distant valleys, the paths are rugged and perilous, permanently cutting off human tracks; who could cause distress and distraction? One can freely practice dhyāna-contemplation, thought after thought on the Path, with praise and blame not arising; this place is supreme.