Internal or spiritual peace, as well as adequate knowledge and insight to keep oneself peaceful in the face of seemingly disharmony or stress, is defined as inner or psychological peace (peace of mind). Numerous people believe that being internally "at peace" is a desirable mental state or homeostasis and that it is the polar opposite of feeling stressed, emotionally disturbed, or unstable. The psychological or internal goal of "peace of mind" is typically equated with ecstasy and satisfaction in the styles of meditation.

A disposition devoid of the consequences of stress is described by words like peace of mind, tranquility, and calmness. Inner peace is thought to be a state of enlightenment that can be achieved through different forms of meditation, prayer, yoga, or other mental or physical exercises in some meditative cultures. Several of these disciplines refer to this serenity as a sense of self-awareness. Traditional Buddhist, Hindu, and some contemporary Christian contemplative practices such as monasticism and the New Age movement place a strong focus on discovering inner self peace.