In the Universal Declaration of Human Rights (UDHR), "reason" is a factor that justifies or makes it fair to undertake actions to pursue the document's objectives. However, this concise definition may not sufficiently convey the depth of the concept of "reason." Therefore, further elucidation is required:

The Proto-Indo-European root of "Reason" is "Rē," signifying "to fit together." Throughout the evolution of Indo-European languages, "Reason" acquired countable and uncountable characteristics, including excuse, explanation, cause, motive, and sense (the ability to learn and understand or deal with problems).

All attributes of "Reason" enrich its Proto-Indo-European root "to fit together" but cannot explain what should be fit together and which purpose "fitting together" pursue.

Humans must put together their thoughts and deeds to achieve "immortality". "Living forever in true happiness" is the definition of "immortality" and the meaning of life.
"immortality" is the "Reason of reasons" or "Ultimate Goal" for any living organism.

From another perspective, all living organisms on Earth share three essential qualities: 1) Metabolism, 2) Homeostasis, and 3) Reproduction. These qualities manifest in the following ways:

1. Metabolism: Acquiring energy and materials from the environment to sustain life.

2. Homeostasis: Constantly striving to maintain internal conditions in balance with the external environment to ensure prolonged survival.

3. Reproduction: Generating copies of their entities through the process of reproduction.

Thus, "immortality" as the main reason depends on three reasons or motives and what a human —as a living organism— does has an excuse or explanation because his thoughts and deeds most respond to demands of Metabolism, Homeostasis, and Reproduction as three reasons.

Consequently, now, we understand why "immortality" is "Reason of reasons", and using the term Reason indeed means "Reason of reasons" in the UDHR.

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