 the Complex Ideas, we mark by the names Obligation, Drunkenness, a Lye, etc. which consisting of several Combinations of simple Ideas of different kinds, I have called Mixed Modes, to distinguish them from the more simple Modes, which consist only of simple Ideas of the same kind. These mixed Modes being also such Combinations of simple Ideas, as are not looked upon to be the characteristical Marks of any real Beings that have a steady existence, but scattered and independent Ideas, put together by the Mind, are thereby distinguished from the complex Ideas of Substances. (II.xxii.1)