Bhagavad Gita · 12.14

सन्तुष्टः सततं योगी यतात्मा दृढनिश्चयः।मय्यर्पितमनोबुद्धिर्यो मद्भक्तः स मे प्रियः॥

santuṣhṭaḥ satataṁ yogī yatātmā dṛḍha-niśhchayaḥ mayy arpita-mano-buddhir yo mad-bhaktaḥ sa me priyaḥ

Always content, self-controlled, firm in conviction, with mind and intellect dedicated to me — such a devotee is very dear to me.

— Bhagavad Gita 12.14

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)