As a science, logic institutes an analysis of the process of the mind in reasoning, and investigating the principles on which argumentation is conducted; as an art, it furnishes such rules as may be derived from those principles, for guarding against erroneous deductions.
Richard WhatelyHabits are formed, not at one stroke, but gradually and insensibly; so that, unless vigilant care be employed, a great change may come over the character without our being conscious of any.
Richard WhatelyIt is an awful, an appalling thought, that we may be, this moment and every moment, in the presence of malignant spirits.
Richard Whately