If it were otherwise, if the Buddha was only aiaiksa dharmas, and if the Sangha (that is, the Saints, Saiksas and Arhats) were only iaiksa and aiaiksa dharmas, a person whose mind is
"worldly" would not be able to be either a Buddha or a Sangha.
Abhidharmakosabhasyam-Vol-2-Vasubandhu-Poussin-Pruden-1991
