Spiritual faith- One of the five Lakṣaṇas (2) (distinguishing characteristics) of Samyaktva (right faith);
faith in the truth- faith in the reality of the soul, the law of Karma, transmigration of soul and the like.
āstikyam- satyaniṣṭhā.
(Jaisidī 5.9 Vṛ)
jīvādayo'rthā yathāsvaṃ bhavaiḥ santīti matirāstikyam.
(TaVā 1.2.30)