Sarvadarshanasangraha 2.14

2.14

sarvaṃ kṣaṇikaṃ kṣaṇikaṃ duḥkhaṃ duḥkhaṃ svalakṣaṇaṃ svalakṣaṇaṃ śūnyaṃ śūnyam iti bhāvanācatuṣṭayam upadiṣtaṃ draṣṭavyam/

It is to be borne in mind that four points of view have been laid out, viz., (1.) All is momentary, momentary; (2.) all is pain, pain; (3.) all is like itself alone; (4.) all is void, void.