तत्त्वtattva[tat-tva] n. (that-ness), very essence, true nature, truth, reality; principle (esp. one of the 25 in the…
[tat-tva] neuter (that-ness), very essence, true nature, truth, reality; principle (especially one of the 25 in the Sâṅkhya philosophy); in the Vedânta philosophy the word is artificially analysed into 'tat tvam,' that (art) thou, as expressing the identity of the multiform phenomenal world (tvam) with the one undifferentiated invisible Brahma (tad): instrumental, -tas, ˚--, in reality; truly; exactly; thoroughly.
जन्म कर्म च मे दिव्यमेवं यो वेत्ति तत्त्वतः ।