In Vajrayana Buddhism's Tantric teachings, the rituals require the guidance of a teacher.
The teacher is considered essential and to the Buddhist devotee, the guru is the "enlightened teacher and ritual master".
The teacher is known as the vajra guru (literally "diamond .
There is no consensus among the different Buddhist traditions as to what constitutes the scriptures or a common canon in Buddhism.
The general belief among Buddhists is that the canonical corpus is vast.
This corpus includes the ancient Sutras organized into Nikayas or Agamas, itself the part of three basket of texts called the Tripitakas.
Each Buddhist tradition has its own collection of texts, much of which is translation of ancient Pali and Sanskrit Buddhist texts of .
Buddhist history in the United States traces to the mid-19th century, when early scholars and spiritual pioneers first introduced the subject to Americans.
During the past two decades, research on Buddhism in America has expanded tremendously.
Here comes some of the most reputable Buddhism scholars in .