Hark! In order to be of maximum benefit to the countless living beings, whose number is as vast as the extent of the skies, one must first gain the state of peerless, complete, perfect buddhahood. It is with this thought in mind that one receives initiation, the root of the Vajrayana path, and then engages in the various Tantric yogas.
Contemplate this theme, and by means of it generate the sublime bodhi-mind as the motivating factor. Also, cultivate the correct attitudes that are to be maintained when listening to the Dharma, as is explained in the many sutras and tantras, and thus listen correctly.
The Buddha, who himself achieved complete enlightenment and who possessed profound skill and great compassion, taught the nectarlike Dharma in accordance with the mental tendencies, capacities, and karmic predispositions of those to be trained.
From From the Heart of Chenrezig: The Dalai Lamas on Tantra by Glenn H. Mullin, page 262