All of Vedanta is contained in this beautiful morning prayer by Adi Shankaracharya. Apparently it was Swami Vivekananda’s favorite prayer which he used to sing often. Swami Vivekananda was a key person in the introduction of the eastern philosophies of Vedanta and Yoga to the western world - starting at the 1893 World Parliament of Religion in Chicago.
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प्रातः स्मरामि हृदि संस्फुरदात्मतत्त्वं
सच्चित्सुखं परमहंसगतिं तुरीयम् ।
यत्स्वप्नजागरसुषुप्तिमवैति नित्यं
Sac-Cit-Sukham Parama-Hamsa-Gatim Turiiyam |
Yat-Svapna-Jaagara-Sussuptim-Avaiti Nityam
Tad-Brahma Nisskalam-Aham Na Ca Bhuuta-Sangghah ||1||
Which gives the Bliss of Sacchidananda (Existence-Consciousness-Bliss essence), which is the Supreme Hamsa(symbolically a Pure White Swan floating in Chidakasha) and takes the mind to the state of Turiya (the fourth state, Superconsciousness),
Which knows (as a witness beyond) the three states of Dream, Waking and Deep Sleep, always,