唯物辩证法认为:事物的内部矛盾是事物发展的内因,事物的外部矛盾是事物发展的外因。无论哪一个事物的发展,都是内因与外因共同作用的结果。但是,内因和外因对事物发展的作用是不一样的,内因是第一位的原因,是事物发展的根据,是事物存在的深刻的基础,是一事物区别于他事物的内在本质。这不仅是事物自己运动的源泉,而且规定着事物发展的方向。外因是第二位的原因,是事物发展的外部条件,它能加速或延缓事物发展的进程,使事物的发展显示出特定的外貌,只能对内因施加各种影响,它对事物发展的作用再大,也要通过内 Materialist dialectics holds that the internal contradictions of things are the internal causes of the development of things and the external contradictions of things are the external causes of the development of things. No matter what the development of things, are the result of both internal and external causes. However, the internal and external causes have different effects on the development of things. The internal causes are the first cause, the basis for the development of things, the profound foundation for the existence of things, and the intrinsic essence that distinguishes one thing from the other. This is not only the source of the movement of things, but also the direction of the development of things. The external cause is the second reason, which is the external condition for the development of things. It can accelerate or delay the process of things development, so that the development of things shows a specific appearance, and can only exert various influences on the internal cause and its effect on the development of things Then big, but also through the inside