This is an excerpt form Swami Prabhavananda's The Spiritual Heritage of India (1962)
The Philonic and Johannean conceptions of the Logos may conceivably owe no debt to Indian thought, for the truth is no monopoly of any race or nation, and with spiritual growth the same truth is often realized by different peoples independently of one another. Yet it is also possible that both Greek philosophers and Christian theologians were in some degree under obligation to India for their initial ideas, since it is a well-known fact that Hindu thought exercises a strong influence upon the minds of early Western thinkers.
What evidence, if any, is there that early Western thinkers were indeed influenced by Hindu thought? Are there any examples among ancient Greek philosophers, say?