Bhagavad Gita 6.4
When a man renounces even the thought of initiating action, and is not interested in sense objects or any results that may flow from his acts, then he truly understands spirituality.
यदा हि नेन्द्रियार्थेषु न कर्मस्वनुषज्जते।
सर्वसङ्कल्पसंन्यासी योगारूढस्तदोच्यते॥yadā hi nendriyārtheṣu na karmasvanuṣajjate|
sarvasaṅkalpasaṃnyāsī yogārūḍhastadocyate||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).