na - not; etat - this; tvayā - by you; dāmbhikāya - to a hypocrite; nāstikāya - to an atheist; śaṭhāya - to a cheat; ca - and; aśuśrūṣoḥ - to one who does not listen with faith; abhaktāya - to a nondevotee; durvinītāya - to one who is not humbly submissive; dīyatām - should be given.

You should not share this instruction with anyone who is hypocritical, atheistic or dishonest, or with anyone who will not listen faithfully, who is not a devotee, or who is simply not humble.