Jains are often calm because Jainism emphasizes inner self-control and non-violence as guiding principles. Here are the core ideas in simple terms:

• Ahimsa (non-violence) and truthfulness reduce conflict inside and outside. By avoiding harm to living beings and speaking carefully, a person experiences less agitation and guilt, which brings calm.
• Aparigraha (non-attachment) means not clinging to possessions, status, or desires. This frees the mind from constant craving and worry, creating steadiness.
• Sensering and controlling kashays (mental passions like anger, pride, deceit, and greed) through right belief and right conduct helps keep emotions steady.
• The five great vows for monks (and the five restraints for laypeople) provide a structured path that minimizes impulsive reactions, leading to peace of mind.
• Regular self-reflection, mindfulness, and ethical living align a person with their inner core, giving a sense of balance and calm even in tough situations.

If you’re curious about how these ideas are taught in Jain texts, I can share simple explanations of specific sutras or stotras and how they point to inner peace.