There are several points you should initially make sure of when considering a Dharma teaching to practise. First, it should be a Dharma taught by the Buddha. Second, it should be one whose meaning has been explained with exactness by scholarly pandits. Finally, the great and accomplished spiritual masters should have achieved realisations of its meaning through meditation. Otherwise, however long we meditate on some other supposedly profound instruction, which was neither spoken by the Buddha nor understood by any pandits or adepts, the only result we are likely to achieve is one that no Buddha or any other accomplished practitioner ever attained.
— Pabongka Rinpoche