Sóder

"Most tantrayana or vajrayana visualization and mantra practices require that an initiation and subsequent authorization and instruction be given by a qualified lama before the sadhana, or ritual practice, can begin. However, a few practices, those that were given publicly by Lord Buddha Shakyamuni, do not fall under such restrictions. Very definitely, all the practices given in the Sutras have the full blessing of the Buddha and therefore can be practiced if one has the aspiration to do so."
--Kalu Rinpoche