Bhagavad Gita · 12.4

सन्नियम्येन्द्रियग्रामं सर्वत्र समबुद्धयः।ते प्राप्नुवन्ति मामेव सर्वभूतहिते रताः॥

sanniyamyendriya-grāmaṁ sarvatra sama-buddhayaḥ te prāpnuvanti mām eva sarva-bhūta-hite ratāḥ

Controlling all their senses, maintaining equanimity everywhere, and engaged in the welfare of all beings — they also attain me.

— Bhagavad Gita 12.4

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