Valerian Pidmohylny said this quote

“ Depression has its degrees which should be clearly marked. There is an absolute depression, when the very foundation of the psychic mechanism is damaged by pressures and we find it very difficult to recover the joy of life. Quite different is a temporary depression which may, at times, be quite poorly directed, like a wind into the human sails. In order to distinguish between the two we might use the test of human reaction to a material improvement. ”