万人马拉松,人潮中没有哪个能止步不前;大江东流去,没有哪滴水可以逆水倒流……在一种大的潮流和氛围中,每个人的心中都充满了神圣和信仰,不由自主地随趋势前进。内因是变化的根本,外因是变化的条件,内外因同时作用于主体,这是哲学命题。内因是主体内在的渴望,外因则是所在环境的促使。环境影响之重要,案例俯拾皆是。1920年9月19日,在印度加尔各答西面的 Million marathons, no one in the crowd can stop; the eastward flow of the river, there is no dripping can reverse the water ... In a large trend and atmosphere, everyone’s heart is full of sacred and faith, involuntarily with Trend. Internal factors are the root of change. External factors are the conditions of change. Internal and external factors act on the subject at the same time. This is a philosophical proposition. The internal cause is the inner desire of the main body, and the external cause is the impetus of the environment. Environmental impact is important, the case abound. September 19, 1920, west of Calcutta, India