महात्मानस्तु मां पार्थ दैवीं प्रकृतिमाश्रिताः।भजन्त्यनन्यमनसो ज्ञात्वा भूतादिमव्ययम्॥
mahātmānas tu māṃ pārtha daivīṃ prakṛtim āśritāḥbhajantyananya-manaso jñātvā bhūtādim avyayam
Word by word
The verse says
But the great souls, Arjuna, taking refuge in the divine nature, worship me with undivided mind, knowing me as the imperishable origin of beings.
In plain words
The counterweight arrives immediately.
Same sentence structure as the verse before, pointed the other way.
Ananya-manasaḥ — with a mind that is not elsewhere. Not a stronger mind. Just one that is not divided.
Where you've felt this · in friendship
A friend of yours remembers the date of the thing you had been dreading, and sends one line on the morning of it. She did not set a reminder and there was nothing in her calendar. She simply kept you in mind, which is a different activity from remembering, and it takes no effort at all once it is happening.
Going deeper
Undivided attention is being named as the whole qualification, and it is not the same as effort.
The great souls in this verse are not described as more disciplined, more learned or more austere than anybody else. What is said about them is where their mind is. Everything else in the line follows from that: they take refuge, they worship, they know the source.
This is the second time in two chapters that the condition turns out to be attention rather than achievement, and the repetition is not accidental.
It lands somewhere useful if you have ever felt that devotion requires a temperament you do not have. Nothing is being asked here about your feelings, your capacity for discipline or your talent for concentration. What is being described is a mind that has stopped being in several places, and most people know the difference from the inside.