心静 (xīn jìng) is a verb phrase meaning 'to have a calm mind' or 'to be inwardly calm'. It describes a state of emotional tranquility, often used in contexts where mental composure is essential for clear thinking, meditation, or stress relief. Unlike the English 'be calm' which can refer to outward behavior, 心静 emphasizes inner peace and stillness. It's commonly seen in fixed expressions like 心静自然凉 ('a calm mind makes you feel cool') and as a prerequisite for concentration.