The Greek roots of the term "Catholic" mean "according to (kata-) the whole (holos)," or more colloquially, "universal." At the beginning of the second century, we find in the letters of Ignatius the first surviving use of the term "Catholic" in reference to the Church. At that time, or shortly thereafter, it was used to refer to a single, visible communion, separate from others.
People often ask, "How should I begin to train myself to defend my faith? How do I prepare for the inevitable knock on the door? I don’t want to have to stand there open-mouthed." The best place to start your homework is the Bible. Almost every American home has one.
"It is impossible for me to understand on what scientific grounds is founded this resurrection of the old materialistic view of the world that had its first great expression from Epicurus and Lucretius. Nothing that I can see justifies it."
~ Joseph Hyrtl; Austrian anatomist; renowned educator, author of classic textbooks on applied anatomy, chair of anatomy at the University of Vienna, Catholic.