Because the root of all human suffering arises from an untamed mind. If you are not at peace within yourself, within your mind, you cannot experience peace and joy no matter how positive your external circumstances may be. If your mind is tame, the opposite is true and you may experience joy regardless of the struggles and obstacles before you. Our perception creates our reality and if you are at peace you can sit quietly alone for extensive periods of time and not be disturbed by this because your mind is calm and does not require stimulation or distraction. These are Buddhist teachings but hold true regardless of which religion one chooses to follow.

Because the root of all human suffering arises from an untamed mind. 

If you are not at peace within yourself, within your mind, you cannot experience peace and joy no matter how positive your external circumstances may be. If your mind is tame, the opposite is true and you may experience joy regardless of the struggles and obstacles before you. 

Our perception creates our reality and if you are at peace you can sit quietly alone for extensive periods of time and not be disturbed by this because your mind is calm and does not require stimulation or distraction. These are Buddhist teachings, but hold true regardless of which religion one chooses to follow.