Verse 37

त्वं चेद्बभूविथ पुरा तथेदानीं भविष्यसि ।अद्य चेह स्थितोऽसीति ज्ञातवानसि निश्चयम्

In plain words

If you existed before, and so too will exist hereafter, and today are established here — this you have come to know with certainty.