Step 1: Concept Identification:
The query seeks to identify the philosophical system that prioritizes compassion and friendliness as its primary ethical virtues.
Step 2: Comparative Analysis:
Examining the core virtues of each philosophy:
1. Buddhism: Key Buddhist ethical concepts are *Karuṇā* (profound compassion for suffering beings) and *Mettā* (benevolent loving-kindness towards all beings). These are two of the four "Brahmavihāras" and are foundational. This aligns perfectly.
2. Jainism: The paramount virtue is *Ahiṃsā* (non-violence in thought, word, and action). Compassion is present but secondary to the core principle of non-harm.
3. Sikhism: Core virtues include *Sevā* (selfless service), *Sat* (truthfulness), *Santokh* (contentment), and *Dayā* (compassion). While compassion is valued, it is one among several key principles.
4. Christianity: The cardinal virtues are Faith, Hope, and Love (*Agape*). Love is central, but the specific combination of "compassion and friendliness" is most distinctly associated with Buddhist terminology.
Step 3: Conclusion:
Buddhism is the philosophy that most explicitly and centrally advocates for compassion (*Karuṇā*) and friendliness (*Mettā*) as its principal ethical virtues.