[…] let us suppose a small number of persons settled in some sequestered part of the earth, unconnected with the rest […]. In this state of natural liberty, society will be their first thought. A thousand motives will excite them thereto, the strength of one man is so unequal to his wants, and his mind so unfitted for perpetual solitude, that he is soon obliged to seek assistance and relief of another, who in his turn requires the same.
Source: wiktionary