He is known for a Latin devotional work Oratio Pia that was published some 14 years after his death, and then translated into English.
[1] Bernard composed Oratio pia, religiosa, et solatii plena, de vera animi tranquillitate.
It was found in the author's study, after his death, and published at London, 1568, with a dedication to the courtier Peter Osborne, by his brother Thomas Bernard who edited the work.
A translation into English, by Anthony Marten, was published under the title of The Tranquillitie of the mind: an excellent Oration directing every man and woman to the true tranquillity and quietness of the minde, London, 1570.
[3] The book is considered an example of the Protestant belles lettres of the period, comparable with works of the Huguenot minister Jean de L'Espine, and of Jeremias Bastingius from Middelburg.