A Sufi mystic is a person who seeks deeper knowledge of the mysteries underlining all things in cosmos and is the lover of the Beloved (God, Allah, Brahman, The Tao, …)
بسم اللہ الرحمٰن الرحیم وَالَّذِينَ يَبِيتُونَ لِرَبِّهِمْ سُجَّدًا وَقِيَامًا [And those who spend the night in worship of their Lord, prostrate and standing. 25:65]