"The sages aforetime acquired their knowledge from the Prophets, inasmuch as the latter were the Exponents of divine philosophy and the Revealers of heavenly mysteries."

 
"Now We have, for the sake of God, the Lord of Names, set Ourself the task of mentioning in this Tablet some accounts of the sages,² that the eyes of the people may be opened thereby and that they may become fully assured that He is in truth the Maker, the Omnipotent, the Creator, the Originator, the All-Knowing, the All-Wise.

Empedocles

Although it is recognized that the contemporary men of learning are highly qualified in philosophy, arts and crafts, yet were anyone to observe with a dis-criminating eye he would readily comprehend that most of this knowledge hath been acquired from the sages of the past, for it is they who have laid the foundation of philosophy, reared its structure and reinforced its pillars. Thus doth thy Lord, the Ancient of Days, inform thee. The sages aforetime acquired their knowledge from the Prophets, inasmuch as the latter were the Exponents of divine philosophy and the Revealers of heavenly mysteries. Men quaffed the crystal, living waters of Their utterance, while others satisfied themselves with the dregs. Everyone receiveth a portion according to his measure. Verily He is the Equitable, the Wise.

Pythagoras

Empedocles, who distinguished himself in philosophy, was a contemporary of David, while Pythagoras lived in the days of Solomon, son of David, and acquired Wisdom from the treasury of prophethood. It is he who claimed to have heard the whispering sound of the heavens and to have attained the station of the angels. In truth thy Lord will clearly set forth all things, if He pleaseth. Verily, He is the Wise, the All-Pervading."

~Bahá’u’lláh

(Tablets of Bahá’u’lláh)
www.bahai.org/r/258267945

Note: 2
In many of the passages that follow concerning the Greek philosophers, Bahá’u’lláh quotes verbatim from the works of such Muslim historians as Abu’l-Fatḥ-i-Sháhristání (1076–1153 A.D.) and Imádu’d-Dín Abu’l-Fidá (1273–1331 A.D.).