Full text https://theanarchistlibrary.org/library/errico-malatesta-mutual-aid-an-essay

Since it is a fact that man is a social animal whose existence depends on the continued physical and spiritual relations between human beings, these relations must be based either on affinity, solidarity and love, or on hostility and struggle. If each individual thinks only of his well being, or perhaps that of his small consanguinary or territorial group, he will obviously find himself in conflict with others, and will emerge as victor or vanquished; as the oppressor if he wins, as the oppressed if he loses. Natural harmony, the natural marriage of the good of each with that of all, is the invention of human laziness, which rather than struggle to achieve what it wants assumes that it will be achieved spontaneously, by natural law. In reality, however, natural Man is in a state of continuous conflict with his fellows in his quest for the best, and healthiest site, the most fertile land, and in time, to exploit the many and varied opportunities that social life creates for some or for others. For this reason human history is full of violence, wars, carnage (besides the ruthless exploitation of the labour of others) and innumerable tyrannies and slavery.