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Tibetans like to say that Tantra is the only vehicle that can allow you to attain enlightenment in a single life and that, otherwise, it would take a few eons of collecting merit.
Yet we've seen others in recent years attain enlightenment through "lesser practices" in one lifetime such as Ajahn Chah with Anapanasati and Vipassana, and I believe Thich Nhat Hanh with mindfulness practice and practicing looking deeply into the nature of things. Well, maybe they did spend a few eons collecting the right amount of merit. Who knows...
So... What's the truth?