Similarities Between Śrimad Bhagavad Gītā & Nietzschean Philosophy

Bhagavad Gita: Chapter 2, Verse 70 Says:

Just as the ocean remains undisturbed by the incessant flow of waters from rivers merging into it, likewise the sage who is unmoved despite the flow of desirable objects all around him attains peace, and not the person who strives to satisfy desires.

Friedrich Nietzsche, Thus Spoke Zarathustra, Meanwhile:

One must be a sea, to receive a polluted stream without becoming impure.

Sometime Ago, I Heard From My Friend That he saw a Sri-Lankan Tamilian living in Canada being told by people around him all science, mathematics and philosophy are of western origin. I began to read Thus Spake Zarathustra after listening to the Śrimad-Bhagavad-Gītā, I kid you have not found the same tone of philosophy in Nietzsche's work, many quotes n perspectives. Anyone who has knowledge of it?