distya samsara-cakre ’smin
upalabdho bhavan adya
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
It is also by good fortune that I am seeing you. Having obtained this opportunity, I feel as if I have taken birth again. Even though one is present in this world, to meet with intimate friends and dear relatives in this material world is extremely difficult.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Vasudeva had been imprisoned by Kamsa, and therefore, although present in Mathura, he was unable to see Nanda Maharaja for many years. Therefore when they met again, Vasudeva considered this meeting to be another birth.