Vivekachudamani - Verse 26
Sanskrit
सर्वदा स्थापनं बुद्धेः शुद्धे ब्रह्मणि सर्वदा ।
तत्समाधानमित्युक्तं न तु चित्तस्य लालनम्
Transliteration
sarvadā sthāpanaṃ buddheḥ śuddhe brahmaṇi sarvadā |
tatsamādhānamityuktaṃ na tu cittasya lālanam
Swami Madhavananda's Translation
Not the mere indulgence of thought (in curiosity) but the constant concentration of the intellect (or the affirming faculty) on the ever-pure Brahman, is what is called Samādhāna or self-settledness.
Index: Vivekachudamani

Muni's Play