131. Conscience, with the man of the church, is formed by the truths of faith from the Word, or from doctrine out of the Word, according to their reception in the heart; for when man knows the truths of faith, and comprehends them in his own manner, and then wills them and does them, he then acquires conscience. Reception in the heart is reception in the will, for the will of man is what is called the heart. Hence it is that they who have conscience, speak from the heart the things which they speak, and do from the heart the things which they do. They have also an undivided mind, for they act according to that which they understand and believe to be true and good.