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Life activity – the interconnected set of different types of the work, providing satisfaction of needs of the specific person, collective, group taking into account requirements and requirements of wider social environment and all society. Liimets Heyno's (1928–1989) – the Estonian teacher, who investigated problems of the theory of education, didactics, philosophy of education and social pedagogics. He developed the concept of integrated didactics. The idea of a system, comprehensive approach to education and training was put forward for studying of difficult children. Need of interaction of social and psychological knowledge with the scientific and pedagogical proved in principle mutual enrichment in education. He as well offered a kind of group work of students and showed that the didactic theory focused only on intellectual development, it is incomplete reflects process of formation of the complete personality. Only educational activity creates conditions for emergence of integrated qualities of the personality allowing graduates of school successfully to be in social life. Liimets characterized the concept as the didactic system uniting in philosophical, sociological and psychological knowledge. Liimets considered education as an interaction between the students and the teacher where favorable conditions for management of the identity of the pupil should be created. Locke John (1632–1704) – English philosopher, founder of British empiricism. In his major philosophical work, Essay Concerning Human Understanding, he argued that knowledge begins in sensation or introspection rather than in innate ideas, as the philosophers of rationalism held. From sensation and reflection the mind receives «ideas», which are the material of knowledge. Some ideas represent actual qualities of objects (such as size, shape, or weight) and others perceived qualities, which do not exist in objects except as they affect observers (such as colour, taste, or smell); Locke called the former qualities «primary» and the latter «secondary». Ideas that are given directly in sensation or reflection are simple, and simple ideas may be «compounded» to form complex ideas. Loneliness – is an unpleasant feeling in which a person feels a strong sense of emptiness and solitude resulting from inadequate levels of social relationships. Loneliness is not a subjective experience, since humans are social creatures by nature. Loneliness has also been described as social pain – a psychological 46