But all these traits of character, which, in themselves considered, are causes of pleasure, in certain circumstances may, to a selfish mind, become causes of unmingled pain. If the displays of intellect or the exhibition of the amiable susceptibilities in another being are viewed by a selfish mind as the cause of disparagement and disadvantageous contrast to itself, they will be regarded only with painful emotions. They will awaken "envy, anger, wrath, malice, and all uncharitableness." This fact is fully illustrated in the history of the world and in the daily observation of life. The _causes of pain_ to the human mind are in most cases owing to these very susceptibilities of enjoyment. The organization of the material frame and of the external world, while it is a source of multiplied and constant enjoyment, is often also the cause of the most intense and exquisite suffering. The strongest conception of suffering of which mind can form any conception is sensitive suffering. There are many minds whose constitution and circumstances are such that they can form but faint conceptions of any pain which results from the exercise of malignant passions, or from other sources of suffering. But every mind soon acquires a knowledge of what sensitive suffering must be, and can form the most vivid conceptions of it. Though few ever suffered the dislocation of joints, the laceration of the flesh, or the fracture of bones, still descriptions of such sufferings are readily apprehended and conceived of, and there is nothing from which the mind so involuntarily shrinks. Another cause of suffering consists in the loss of present or expected enjoyment. There are many blessings which seem desirable to the mind that are never secured, and yet unhappiness is not caused by the want; but there is no happiness which is actually in possession of which the loss does not occasion pain. We may desire the esteem and affection of certain beings, and yet not become unhappy from the want of it; yet nothing sends such exquisite suffering through the mind as the conviction that some beloved object has ceased thus to respect and to love, or has been taken from us by death. Thus, also, if wealth, which is the means of purchasing a variety of blessings, be not secured, the heart can desire it without being made unhappy by the wish, yet the loss of wealth is attended with painful disappointment and regret. The possession of power, also, may be desired without uneasiness, but the loss of it seldom occurs without painful emotions. Another cause of suffering is inactivity of body and mind. It has been shown that desire is the spring both of mental and of physical activity, and that this activity is one source of enjoyment. The loss of this species of enjoyment is followed by consequent inquietude and uneasiness.