Bhagavad Gita, Chapter 12, Verse 9

If you are unable to fix your mind steadily on Me, then by Abhyâsa-Yoga do you seek to reach Me, O Dhananjaya.

Krishna offers a real, easier alternative here rather than expecting instant mastery.

For anyone who can't hold steady focus right away, practiced, repeated remembering is named as a genuine, workable substitute. Real progress through practice is treated as just as valid as instant success.