In this year, (1676,) he published “_The Apology for True Christian Divinity_,” in Latin, at Amsterdam, which is the most celebrated of his works. It is dedicated to King Charles II.; and the dedication is remarkable for the freedom and boldness of sentiment and language in which his majesty is addressed. “Thou hast tasted,” he says, “of prosperity and adversity; thou knowest what it is to be banished thy native country, to be over-ruled as well as to rule, and sit upon the throne; and, being oppressed, thou hast reason to know how hateful the oppressor is both to God and man. If, after all these warnings and advertisements, thou dost not turn to the Lord with all thy heart, but forget him who remembered thee in thy distress, and give up thyself to folly, lust, and vanity--surely great will be thy condemnation.”--The _Apology_ is reared on the “_Theses Theologicæ_,” being an exposition of the fifteen propositions contained in that work. The author’s general plan is, to state the position he means to establish, and to support it by Scripture quotations applicable to the case, or to deduce it by an argument in the form of a syllogism. By this learned work, he acquired great celebrity as a deep theologian, profoundly skilled in the scriptures, the fathers, and church history. His next publication, which also appeared this year, is entitled, “_The Anarchy of the Ranters_,” and it is a vindication of the society from the imputation of disorderly practices in their discipline, of which they were accused by their adversaries. About the end of September, the Apologist returned to Ury; and although he had obtained his father’s release from confinement, yet he was not able to protect himself. On the 7th November 1676, he was committed to prison in Aberdeen, along with several other Quakers, for holding meetings for public worship, and did not regain his liberty until the 9th of April 1677. While in prison, he wrote a treatise, entitled, “_Universal Love considered and established upon its right foundation_,” which was published after his release.