Yoga Sutras of Patanjali · 1.44

एतयैव सविचारा निर्विचारा च सूक्ष्मविषया व्याख्याता ॥४४॥

etayaiva savicārā nirvicārā ca sūkṣmaviṣayā vyākhyātā

By the same process, samadhi with reflection and without reflection on subtle objects is also explained.

— Yoga Sutras of Patanjali 1.44

Source: Sanskrit attributed to Patanjali (c. 2nd century BCE – 4th century CE). Public-domain English readings drawn from Swami Vivekananda's 'Raja Yoga' (1896) and Charles Johnston's 'The Yoga Sutras of Patanjali' (1912).