य इमं परमं गुह्यं मद्भक्तेष्वभिधास्यति।भक्तिं मयि परां कृत्वा मामेवैष्यत्यसंशयः॥
ya idaṃ paramaṃ guhyaṃ mad-bhakteṣv abhidhāsyatibhaktiṃ mayi parāṃ kṛtvā mām evaiṣyaty asanśayaḥ
Word by word
The verse says
Whoever passes this highest secret on to those who love me, having shown the greatest love to me, will come to me. There is no doubt of it.
In plain words
And immediately the opposite side of the restriction.
The previous verse said who not to tell. This one says that telling the right people is itself the highest act of love.
So the restriction was never about hoarding. It was about aim. Teaching is the thing being praised here, just not indiscriminate teaching.
Where you've felt this · in friendship
A colleague in your first job once showed you how to do something properly and took real time over it. They are not in your life any more and you cannot repay them. You have since taught it to two other people the same careful way. That is the only form the repayment could have taken.
Going deeper
Passing something on being called the greatest act of love is a notable thing for a book about devotion to say.
You might expect the highest devotion to be something done privately and vertically: worship, meditation, surrender. What is named instead is horizontal. You give it to someone else, and that is counted as the fullest love of God available.
This changes what the preceding chapters were for. Everything described has a direction out of the person who has it. Knowledge in this account is not a possession to be held and perfected; it is something in transit.
And it sets an achievable standard for a reader who feels unqualified. You do not need to have finished anything to hand on what helped you. The verse asks only that it goes to someone who wants it, which is the same condition as the verse before.