way as we look at the fact that men have social instincts, sympathetic inclinations, and so on. 5. PUFFENDORF. In the struggle to give to just and equitable relations in the State an independent basis of their own, and to found a judicial system of government, reflective thought put forth its efforts; and this became to it a real interest and concern. And, as in the case of Grotius, it was also true of Puffendorf, that the instinct of mankind—that is, the social instinct, &c.—was made the principle. Samuel von Puffendorf was born in 1632 in Saxony; he studied public law, philosophy, and mathematics at Leipzig and Jena; in 1661, as a professor at Heidelberg, he made natural and civil law for the first time academic studies; in 1668 he became tutor in a Swedish family, which office he later on exchanged for the service of the House of Brandenburg, and in 1694 he died at Berlin as a privy councillor. He wrote several works on political law and history; we must specially mention his work, _De jure naturæ et gentium_, Libr. viii., Londin. Scan. 1672, 4; and also his compendium _De officio hominis_, published at the same place in 1673, 8, and _Elementa jurisprudentiæ universalis_.[238] While the divine right of kings was here still recognized—whereby they rendered account to God alone, or, at all events, were still bound to take counsel of the Church—the impulses and necessities present in mankind were now considered as well. These were regarded as the inward principles for private and political law, and from them the duties both of the government and of rulers were deduced, so that the freedom of mankind might not be interfered with. The basis of the state in Puffendorf’s view is the social instinct: the highest end of the state is the peace and security of social life through the transformation of inward duties as prescribed by conscience into external duties as compelled by law.[239] 6. NEWTON. The other side is that thought likewise applied itself to nature, and in this connection Isaac Newton is famous by reason of his mathematical discoveries and his work in physics. He was born in 1642 at Cambridge, made a special study of mathematics, and became professor of the same at Cambridge; later on he was made president of the Royal Society in London, and he died in 1727.[240]