युगपच्चतुष्टयस्य तु वृत्तिः क्रमशश्च तस्य निर्दिष्टा ।
दृष्टे तथाऽप्यदृष्टे त्रयस्य तत्पूर्विका वृत्तिः ॥ ३० ॥

yugapaccatuṣṭayasya tu vṛttiḥ kramaśaśca tasya nirdiṣṭā ।
dṛṣṭe tathā’pyadṛṣṭe trayasya tatpūrvikā vṛttiḥ ॥ 30 ॥

Yugapat=simultaneous; catuṣṭayasya=of the four; tu=indeed; vṛttiḥ=functioning; kramaśaḥ=sequential; ca=and; tasya=its; nirdiṣṭā=is said to be; dṛṣṭe=as for perceptible objects; tathā=same; api=too; adṛṣṭe=with regard to unseen (belonging to past or future); trayasya=of the three; tatpūrvikā=is preceded by; vṛttiḥ=function

Regarding the objects of the senses, the functioning of the four (three internal organs and one of the outer sense organs) is said to be either simultaneous or successive. The functions of the three internal organs (mind, ego, intellect) in respect of an unseen object is preceded by the fourth (organ of outer sense perception).

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