GURMAT (gurmat, mat, Sanskrit mati, i.e. counsel or tenets of the Guru, more specifically the religious principles laid down by the Guru) is a term which may in its essential sense be taken to be synonymous with Sikhism itself. It covers doctrinal, prescriptive and directional aspects of Sikh faith and praxis. Besides the basic theological structure, doctrine and tenets derived from the teachings of Guru Nanak and his nine successors, it refers to the whole Sikh way of life both in its individual and social expressions evolved over the centuries. Guidance received by Sikhs in their day today affairs from institutions established by the Gurus and by the community nurtured upon their teachings will also fall within the frame of gurmat.
BHAI, of Indo Aryan origin (Sanskrit bhratr, Pali bhaya), means brother in its literal sense and is employed as an honorific as well as in the dominant familial sense and as a title of affection between equals. It has been used in the Guru Granth Sahib in the latter sense and there are several apostrophic examples none of which seems to imply any special rank or status. However, by the middle of the seventeenth century, it was being used as a title implying distinction: the earliest example is the Bala Janam Sakhi (AD 1658) which refers to its putative author as Bhai Bala. The naturalness of its use in this particular context suggests that it must have developed the honorific connotation even earlier though it does not necessarily follow that these connotations were clearly apprehended in earlier usage.
BHANA, lit. liking, pleasure, will, wish or approval, is one of the key concepts in Sikh thought. In Sikhism, it refers specifically to God`s will and pleasure. Raza , an Arabic term popular in the context of various schools of Sufi thought, also appears frequently in the Sikh texts to express the concept of UMArSA bhana. According to this concept, the Divine Will is at the base of the entire cosmic existence. It was His bhana, His sweet will which was instrumental in the world`s coming into being: "Whenever He pleases He creates the expanse (of the world of time and space) and whenever He desires He (again) becomes the Formless One (all by Himself)" (GG, 294).
KATHA is the noun form of the Sanskrit word kath, meaning to speak, describe, narrate or interpret. In religious terminology, kathd stands for exposition, analysis and discussion of a passage from a scripture. It involves a full length discourse on a given text, with a proper enunciation of it and elucidation with anecdotes, parables and quotations, of the underlying spiritual and theological doctrines and ideas. Since scriptural utterances and verses were generally pithy and aphoristic, they needed to be expounded for the laity and there emerged in the Indian tradition forms such as tikd (paraphrase), sabddrlha (gloss) and bhdsya (commentary), with pramdnas or suitable authoritative quotations from religious and didactic works to support the thesis or interpretation.