有空中三時

The 法相宗 Dharmalakṣaṇa school divides the Buddha's teaching into three periods, in which he taught

(1) the unreality of the ego, as shown in the 阿含 <Āgama>s, etc.;

(2) the unreality of the dharmas, as in the 船若 <Prajñāpāramitā>, etc.; and

(3) the middle or uniting way, as in the 解深密經 <Sandhinimocana-sūtra>, etc., the last being the foundation text of this school.