Of the sects which have exercised great influence on Japanese mentality, the following are specially to be mentioned: the Tendai, the Shingon, the Zen, the Hokke, and the Jodo, with its offspring the Ikkô sect. Each of these chose its own means of reaching enlightenment from among those indicated by Shâkya-muni, but did not on that account entirely reject the means of salvation preferred by the others. Some give long lists of categories and antitheses, and seek to define the truth with a more than Aristotelian precision of detail, while others think it advisable to realise it by dint of faith alone. But among these means of salvation the practice advocated by the Zen sect is worthy of special consideration in this place, as it has exercised great influence in the formation of the Japanese spirit. _Zen_ means 'abstraction,' standing for the Sanskrit Dhyâna. It is one of the six means of arriving at Nirvâna, namely, (1) charity; (2) morality; (3) patience; (4) energy; (5) contemplation; and (6) wisdom. This practice, which dates from a time anterior to Shâkya himself, consists of an 'abstract contemplation,' intended to destroy all attachment to existence in thought and wish. From the earliest time Buddhists taught four different degrees of abstract contemplation by which the mind frees itself from all subjective and objective trammels, until it reaches a state of absolute indifference or self-annihilation of thought, perception, and will.[14] [14] E. J. Eitel's _Handbook of Chinese Buddhism_, p. 49.