Verse 4

यदा सर्वमिदं किंचित्सबाह्याभ्यन्तरात्मकम् ।अपलप्य वसेच्चेतः सत्तासामान्यता तदा

In plain words

When, having negated all of this, whatever it is, having the nature of both the outer and the inner, the mind still abides, that is sattā-sāmānyatā.