Isaac Barrow was an English mathematician and theologian, known for his work in developing the foundations of calculus. He was the first to recognize the fundamental theorem of calculus, which later became the cornerstone of the discipline. Barrow's lectures on mathematics and optics were highly influential, and he was also a mentor to Sir Isaac Newton, who built upon Barrow's work to develop his own theories. In addition to his contributions to mathematics, Barrow was a respected theologian and scholar, serving as the Master of Trinity College, Cambridge.

"That justice should be administered between men, it is necessary that testimonies of fact be alleged; and that witnesses should apprehend themselves greatly obliged to discover the truth, according to their conscience, in dark and doubtful cases."



"Even private persons in due season, with discretion and temper, may reprove others, whom they observe to commit sin, or follow bad courses, out of charitable design, and with hope to reclaim them."



"He who loveth a book will never want a faithful friend, a wholesome counsellor, a cheerful companion, or an effectual comforter."



"That in affairs of very considerable importance men should deal with one another with satisfaction of mind, and mutual confidence, they must receive competent assurances concerning the integrity, fidelity, and constancy each of other."



"Because men believe not in Providence, therefore they do so greedily scrape and hoard. They do not believe in any reward for charity, therefore they will part with nothing."



"Facetiousness is allowable when it is the most proper instrument of exposing things apparently base and vile to due contempt."



"Let us consider that swearing is a sin of all others peculiarly clamorous, and provocative of Divine judgment."



"Whence it is somewhat strange that any men from so mean and silly a practice should expect commendation, or that any should afford regard thereto; the which it is so far from meriting, that indeed contempt and abhorrence are due to it."

