भावाभावेषु यत्तुल्यं तन्नाशे तत्स्थितौ च वा ।यः प्रयत्नस्त्वबुद्धित्वात्तद्योगगमनं भवेत्
In plain words
That which is the same amid being and non-being — whether in its destruction or in its continuance — whatever effort [is made] through lack of understanding would be a going into yoga, a joining, with that.