But material substances are not the only food that we consume. As "food" we, as souls, also use impressions (Russian religious psychologist Georgy Gurdjieff was among those who talked about it in these terms in the beginning of the 20th century [16,34]). And if we want to "turn away from evil and cling to the good" we need to take any opportunity for "food" of this kind — in nature, art, communicating with spiritual people etc. and attuning to the subtle and harmonious phenomena. At the same time we need to keep away from coarse impressions, which are primarily created by people of the tamas guna. This was taught by Jesus Christ, Babaji and Sathya Sai Baba: Their opinions regarding this issue are collected in the book .