Introduction to Philosophy: Big Questions and Key Thinkers

Philosophy

The careful use of reason to think about the biggest and most basic questions in life, such as what is real, what we should do, and what we can know.

Philosophical question

A deep, general question that cannot be settled by simple facts alone and needs reasons and arguments about meaning, value, or possibility.

Ethics

A branch of philosophy that studies right and wrong, good and bad, and how we should act or live.

Metaphysics

A branch of philosophy that studies what is real and what exists, including questions about time, free will, and the nature of objects and persons.

Epistemology

A branch of philosophy that studies knowledge and belief: what it means to know something and how we can tell what is true.

Political philosophy

A branch of philosophy that studies power, justice, rights, and how societies and governments should be organized.

Argument (philosophy meaning)

A set of statements where some (premises) are given as reasons to support another (the conclusion). Not the same as a fight.

Opinion / Assertion

A statement of belief or attitude without giving reasons. Can be turned into an argument by adding premises.

Premise

A supporting statement or reason in an argument, offered to show why the conclusion should be accepted.

Conclusion

The statement in an argument that the premises are meant to support.

Validity (valid argument)

An argument is valid if, whenever all its premises were true, the conclusion would have to be true as well. It is about structure, not actual truth.

Soundness (sound argument)

An argument is sound if it is valid and all its premises are actually true. A sound argument has a true conclusion.

Socratic questioning

A method of asking step-by-step questions to test and clarify beliefs, instead of just giving answers.

The examined life

Socrates' idea that a good life requires thinking carefully about your beliefs, choices, and values.

Plato's dialogues

Written conversations where characters discuss big questions, used to show philosophy as an active discussion.

Search for definitions (Plato)

Plato's effort to find clear meanings of ideas like justice or courage, not just list examples.

Aristotle's logic

Aristotle's study of valid argument patterns, where true premises guarantee a true conclusion.

Virtue (Aristotle)

A good character trait, like courage or honesty, often seen as a balanced middle between two extremes.

Ethics / Moral Philosophy

The area of philosophy that asks how we should live and what we ought to do; it studies right and wrong, good and bad, and what makes actions or people morally good.

Moral Question

A question about what is right or wrong, or what we ought to do, especially when our actions affect others, fairness, harm, rights, or respect.

Moral Dilemma

A hard choice where each option has something good and something bad; there is no obvious solution that avoids all harm or unfairness.

Consequentialist Thinking

An approach that judges actions mainly by their consequences (outcomes), aiming for the best overall results or the greatest balance of good over harm.

Deontological Thinking

An approach that focuses on duties, rules, and rights; some actions are right or wrong because of the kind of action they are, not just because of their outcomes.

Virtue Ethics

An approach that focuses on character and virtues; it asks what a good, wise person would do and what kind of person you are becoming through your actions.

Metaphysics

A part of philosophy that studies basic questions about reality, such as what exists, what is real, whether we have free will, and what makes a person the same over time.

Appearance vs. reality

The idea that how things seem to us (appearance) may be different from how they truly are (reality). For example, a straight stick looks bent in water.

Free will

The ability to genuinely choose between different options, where it is really possible for you to have done otherwise.

Determinism

The view that every event is fixed by earlier events and the laws of nature, like a long chain of falling dominoes.

Personal identity

The question of what makes a person at one time the same person as a person at another time.

Thought experiment

An imaginary case used to test ideas and theories, such as teleporters or the Ship of Theseus.

Epistemology

The part of philosophy that studies knowledge: what we can know, how we know it, and what makes beliefs reasonable or unreasonable.

Belief

Anything you accept as true in your mind. Beliefs can be true or false.

Truth

When a belief matches reality; the world really is the way the belief says it is.

Knowledge (simple idea)

A belief that is true and supported by good reasons or evidence.

Perception

A source of knowledge that comes from your senses: seeing, hearing, touching, tasting, and smelling.

Memory

A source of knowledge based on what you remember from past experiences.

Political philosophy

The branch of philosophy that studies how we should live together in groups and societies, including questions about power, justice, rights, and the role of the state.

Justice

A basic idea about fairness in how benefits and burdens are shared, how people are treated, and how rules and punishments are set.

Liberty (freedom)

The ability to act, speak, or think without unnecessary interference from others or from the government.

Equality

The idea that people should be treated as having the same basic moral worth, often including equal rights, equal respect, and fair opportunities.

Right

Something a person is allowed to do or have, which others (including governments) should respect or protect.

Human rights

Basic rights that belong to all humans simply because they are human, such as freedom from torture and access to basic education.

Philosophy of mind

A branch of philosophy that studies what minds are, how they relate to brains and bodies, and what consciousness and mental states are.

Brain

The physical organ in your head, made of cells and chemicals, that can be scanned, touched, and studied by doctors and scientists.

Mind

Your inner mental life: thoughts, feelings, memories, images, and experiences as they feel from the inside.

Consciousness

The fact that there is something it is like to be you from the inside; your experiences such as seeing colors, feeling pain, or being embarrassed.

Problem of other minds

The puzzle of how we can know that other beings are conscious, since we only see their behavior and cannot directly feel their experiences.

Physicalism

The view that minds are fully physical; mental states are based completely in physical processes like brain activity.