維摩經略疏垂裕記 2.58

2.58

Second, from "One should know" onwards, concluding and indicating. "The horizontal and vertical virtues": Jingxi says: understanding with the wisdom of all modes and traversing all practices is called 'horizontal'; using wisdom to approach principle in relation to practice is called 'vertical', because principle is deep and practice is broad. Alternatively, one may say: understanding is horizontal and practice is vertical—understanding is complete at the initial mind, while practice is accomplished only gradually. Or again, understanding and practice each have both horizontal and vertical aspects. Therefore we know that by merely speaking of understanding and practice, nothing is left uncollected.