Idealism is a philosophy that ultimately assumes consciousness has primacy over reality. This means that the mind is not ultimately restricted by an external reality, and that reality is created by the mind. In other words, reality is created by ideas in the mind. Here are some arguments against idealism: 1. Consciousness is a faculty of awareness which means that it could not be aware of anything unless there was something independent of consciousness to be aware of.
2. Idealism assumes that consciousness creates existence in reality. If consciousnesses really could create reality, then it could make a reality where contradictions exist. If contradictions could exist then there is no law of identity. Idealism assumes the law of identity whenever it uses the word "is". Since idealism holds that existence is only in the mind, it is assuming the law of identity. Therefore, idealism is self-refuting since it assumes that which it implicitly denies.
3. Idealism assumes that consciousness can create something from nothing. This violates the law of identity. Nothing is nothing and to assume that nothing can become something is to assume that 'A' can equal 'not A' . Therefore idealism rests on a contradictory premise. Contradictions do not exist. Therefore idealism is false.