Proast, Jonas an English divine, flourished in the closing half of the 17th and the early part of the 18th century. He is noted as a controversialist, and wrote, among other things, Letters on Toleration (169091, and since). There is nothing accessible regarding his personal history. Leckey (Hist. of Rationalism, 2, 87) is the only writer of note who has considered Proast;
neither Leslie Stephen (Hist. of English Thought in the 18th Century) nor Tulloch (Rational Theology in the 18th Century) mentions him.