"Conscience," Wikipedia. Summaries of definitions, religious, secular, and philosophical views of conscience together with extensive references.
Douglas Langston. "Medieval Theories of Conscience." Stanford Encyclopedia of Philosophy. The use and philosophy of "conscience" and synderesis by Bonaventura, Aquinas, Scotus, Ockham, and others. Links to other sources provided.
J. Rickaby, "Conscience,". Catholic Encyclopedia. An summary account of the definition, history, and philosophy of conscience from a religious point of view from New Advent.
W. R. Sorley, "Conscience." Dictionary of Philosophy and Psychology. An entry on "conscience" in James Mark Baldwin's 1901 dictionary online.
Synderesis is the ability to act in accordance with our innate conscience's distinction of good from evil. Eds.