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

atha chittaṁ samādhātuṁ na śhaknoṣhi mayi sthiram abhyāsa-yogena tato mām ichchhāptuṁ dhanañjaya

And if thou art not able firmly to fix thy mind on Me, then by the yoga of practice seek to reach Me, O Dhananjaya.

In plain words: Krishna says that if Arjuna cannot keep his mind steady on him, he should reach him through regular practice. Dhananjaya is a name for Arjuna.