Descartes' fourth meditation shows that God can never be a liar because God is infinitely good. In order to judge something that requires understanding and will, you should know that understanding is infinite, in other words, it is ability. It can not be understood or recognized clearly, but an error occurs. Therefore, based on this fact, we can understand that mistakes are ours and we are not wrong with God. Since mind is mere infinite entity, he can not blame us for giving us unrestrained will.
The first meditation of the first meditation meditation reflects the number of lies the meditator thought of in his life and the ability of the body to deceive him, so it is "what can be suspected". Sitting alone in the fire, he decided to disassemble his previous opinion and rebuild his knowledge on a more clear foundation. But when the meditator dreamed that he perceived the real thing, he realized that he was often convinced. He was awake and convinced that he was sitting beside the fire, but he often dreamed about this sort of thing, reflecting what he was fully convinced of. After further consideration, he realized that even simple things would be questioned. God who can do anything can even fake our mathematical concept. Some people may say that God is very kind and does not make Descartes incorrectly believe all these things.
Thinking to be the basic text of modern philosophy, meditation of the first philosophy brings up a number of powerful arguments that have influenced the discussion of epistemology, spiritual philosophy and religious philosophy to this day. This new translation includes a revised version of the Latin version of the 2nd edition (1642) and the late French translation (1647) making Descartes' inference as clear and appealing as possible. This version also includes a brief introduction to Andrew Bailey's famous collection, Descartes and Meditation revised and extended from the original philosophy. This introduction will help the reader to understand the background and purpose of the Descartes project.
By contemplating the first philosophy, Descartes metaphysics was established. It recognizes his physics, as you can see from the analogy of his tree. In philosophical principles Descartes calculates the fundamentals of physics, and the first part is actually meditation meditation (slightly different). "Principles" are texts which greatly influence the development of modern physics. For example, Isaac Newton (1643-1727) will develop his physics as a reaction to Descartes and use the latter as his own foil. Actually, Newton's Principia (principle) may be called a tribute to Descartes' book. Therefore Descartes' physics (and his metaphysics) are thought to be incorrect, but it plays an important role in the development of modern physics.