維摩經玄疏 2.103

2.103

Second, discerning the threefold contemplation in a single mind: this is precisely what is cultivated by bodhisattvas of sharp faculties in the perfect teaching. Why is this so? The principle of causes and conditions of the inconceivable mind is extremely profound and subtle, and its gate of contemplative wisdom is difficult to understand and difficult to enter. Now, clarifying this threefold contemplation in a single mind also has three points: first, clarifying the inconceivable object of contemplation; second, clarifying the threefold contemplation that is able to contemplate; third, clarifying the verification and attainment.