叢林之中，善知識處，深山幽谷，可依止之。綠水青山，是經行之處。谿邊樹下，是澄心之處也。觀無常不可忘，是勵探道心也。 - Keizan

You must spend time in a monastery, among wise and compassionate people. Or, you must travel deep into the mountains and valleys, practicing concentration next to flowing streams amid the mountains or clearing the mind by sitting in meditation in a valley. You must carefully observe impermanence and never forget its significance, for this inspires the mind in the pursuit of the Way.

打坐工夫，或向胞胎未生，不起一念已前行履工夫，二空忽生，散心必歇。

坐禪觀舉體無二，抛下萬事，休息諸緣，佛法世法不管，道情世情雙忘，無是非無善惡，何防止之有乎，此是心地無相戒也。