...by union with the special tantric wisdom one experiences The samsaric and nonsamsaric joys of four types. Through causing the moonlike energies to descend, Reversing their flow, and blending the vital energies, One becomes adorned by nonsamsaric Gnosis.
Vajra Verses of the Whispered Tradition by Naropa [mid-eleventh century] as quoted by the Second Dalai Lama in his Treatise on the Six Yogas of Niguma. Published by Snow Lion (2006) in The Dalai Lamas on Tantra, translated by Glenn H. Mullin.
"We must accept our burdens gracefully, for when the student takes the Path, he is often plunged into ranges of experience which other men escape, in order to teach him to have command of himself in his environment, and thus learn the reason why he has been placed there."