Idealism (noun)

1. The theory that reality is fundamentally mental or spiritual.
2. The pursuit of ideals.
3. The tendency to represent things in an ideal form, rather than as they are in reality.

Origin:

From french idéalisme, from idéal, from latin idealis, from idea.

Examples:

1. His idealism led him to believe that peace could be achieved through diplomacy.
2. The artist's work reflects her idealism and her belief in the power of beauty.
3. The philosopher's idealism influenced his theory that the external world is a product of the mind.
4. His idealism led him to commit to a career of public service, rather than pursuing more lucrative options.
5. The company's idealism was reflected in its stated mission to make the world a better place.