Essential Philosophical Theories from Hume to Descartes
Hume’s Moral Emotivism
David Hume’s ethical approach is original and critiques the ethical traditions of Western philosophy. He argues that the historical error has been defending an ethics based on reason, which stems from an ignorance of human nature. Through this critique of rationalism, Hume denies the ability to establish moral criteria based solely on logic. In the realm of morals, Hume argues that feelings determine moral evaluation. Sentiments such as pleasure and pain constitute moral values. Reason's only task is to arouse passions or establish order among them. Moral judgment is ultimately based on the moral sense of empathy, which is an inherent quality in humanity.
Plato’s Theory of Ideas
Ideas are entities that exist beyond the sensible world and form the true reality; they are eternal, universal, and intangible. They exist above the physical world and are not merely subjective thoughts, but the objective contents of consciousness.
Plato’s Political Utopia
The Platonic ideal state is understood through a structural relationship to the tripartite view of the soul. This state is organized around three primary social groups:
- Rulers: Governed by wisdom.
- Guardians: Governed by courage.
- Producers: Governed by temperance.
Aristotelian Virtue
Virtue is an acquired trait, categorized into two types: intellectual (aimed at perfect knowledge) and moral (aimed at perfecting character). Prudence is a special virtue; without it, it is impossible to choose the golden mean between extremes.
Augustine’s Internalization Process
Internalization is the process by which we discover revealed truth. It involves looking within oneself to understand human nature. Through this process, one becomes aware that human nature is finite and changing. This leads a person to look beyond themselves, a movement complemented by self-transcendence.
The Theory of Abstraction
The theory of abstraction explains the origin of concepts. Concrete figures are captured by the senses, and memory retains an image of them. The agent intellect then eliminates the specific characteristics of the image to find the universal essence. Finally, the passive intellect develops the formal concept from the data provided.
Aquinas and Natural Law
The existence of natural law is derived from the inherent trends of human nature, embodied in three precepts:
- Substance: The drive to preserve one's life.
- Animal Nature: The drive to conserve the species.
- Rationality: The drive to seek the truth.
Descartes’ Methodological Doubt
Methodological doubt involves questioning all forms of knowledge—including sensory perception, rational logic, and the distinction between dreaming and waking—in order to find an indubitable, real truth.
The Definition of Substance
A substance is defined as a thing that exists in such a way that it needs no other thing to exist. Strictly speaking, this definition applies only to God, who exists by His own nature.