肇論新疏 1.30

1.30

諸經論中多明四句，謂有、無、亦有亦無、非有非無，依法表德，不出此四。又約破計遣謗亦有四句，謂非有、非無、非非有非非無、非亦有亦無。今所牒者，前之第四及後之初二句。所以偏牒此而明者，為遣二見故、遮示中道故、令心無住故，為下不真空論之宗。

Various sūtras and treatises often clarify the four tetralemmas, namely: existent, non-existent, both existent and non-existent, and neither existent nor non-existent. Expressing virtues based on dharmas does not go beyond these four. Furthermore, in terms of refuting attachments and eliminating slanders, there are also four propositions, namely: not existent, not non-existent, not neither-existent-nor-non-existent, and not both-existent-and-non-existent. What is cited now are the fourth of the former [tetralemma] and the first two propositions of the latter. The reason for specifically citing these to clarify them is to eliminate the two views, to block [extremes] and reveal the Middle Way, and to cause the mind to be without abiding; this serves as the main doctrine for the Buzhenkong lun below.