 Further, the "Leiden Synopsis" was intended to provide a Dutch Reformed orthodoxy, providing a manual of 880 pages covering 52 disputations, a resource for apologetics.The posthumous "Opera Omnia" (1643) contains "De opinione chiliastarum" with views on millennarianism.Walaeus had corresponded with Joseph Mede, and his attitude to Cerinthus, Johannes Piscator and Johann Heinrich Alsted in this area was negative, instead placing the Second Coming away from terrestrial events.