- the use of pictures or letter designs as objects of meditation
- the repetition of specific words or phrases, such as the divine names, to produce profound meditative state
- The Grellier Hekhalot, Textbook of the Merkava School
- The works of Abraham Abulafia
- Joseph Gikatalia's Gales of Light
- The Glltes of Holiness
- Gale of The Holy Spirit, Textbook of the Lurianic School