Bhagavad Gita 12.9

अथ चित्तं समाधातुं न शक्नोषि मयि स्थिरम्।अभ्यासयोगेन ततो मामिच्छाप्तुं धनञ्जय ॥१२.९॥

atha cittaṃ samādhātuṃ na śaknoṣi mayi sthiramabhyāsayogena tato māmicchāptuṃ dhanañjaya

If you are unable to fix your mind steadily on Me, then seek to reach Me through the yoga of constant practice, O Arjuna.

गीता