Inner peace (or peace of mind) refers to a state of being mentally and spiritually at peace, with enough knowledge and understanding to keep oneself strong in the face of discord or stress. Being “at peace” is considered by many to be healthy (homeostasis) and the opposite of being stressed or anxious. Peace of mind is generally associated with bliss, happiness and contentment.

Peace of mind, serenity, and calmness are descriptions of a disposition free from the effects of stress. In some cultures, inner peace or Zen is considered a state of consciousness or enlightenment that may be cultivated by various forms of training, such as prayer, meditation, T’ai Chi Ch’uan or yoga, for example. Many spiritual practices refer to this peace as an experience of knowing oneself. Finding inner peace is often associated with traditions such as Hinduism and Buddhism.
There are different ways to find inner peace. But you need to understand this very simple thing that inner peace is all inside you its no where out in the world.

Few easy ways to help you find inner peace

Inner Peace

Inner Peace

Accept the things as they are. Do not try to change people. What we cannot change, what we cannot influence no matter what, should not be a concern to us. This is what so many people, focus and linger on things which they have no control over. Why worry about something that all the worrying in the world will not change? Why care about what other people think of you when you are not even sure what it is they are actually thinking? Once you open the blinds to this fact, and start accepting what is that you cannot change, you automatically relieve yourself of a mountain of stress and anxiety.
Learn to smile and let go. Do not keep on holding on to things. Whenever you are laughing or smiling, something interesting happens. Not only does something happen on a chemical level to make you feel better, but it also stops all stress and negativity from entering your psyche. A simple smile can make such a difference. If you learn the lesson to let go and forgive there will very less load and stress left in your life. As you forgive , you are forgiven.
Never lose hope and faith. Hope and faith is something you can never afford to lose. With hope you always have a path towards peace. Whenever you get too stressed out and overwhelmed within our own life, you forget that hope and faith in God. We forget that the sun always shines after a rainy day, and that this is merely a bump in the road. With hope and faith you know that whatever is seemingly terrible, is only temporary and that soon enough, things will be just fine. This lifts off all of that negativity from my entire being, and I feel better pretty much instantly.
Live in present situation. Do not keep thinking what will happen in future or the mistakes that you have done in past.  Living in the present moment erases all such thoughts. Why worry about something in the past that we cannot ever change? (accept what is). Why worry about something that we are not even sure will happen or not? This is why in the present moment, you find true inner peace. In the present moment, there are no problems and no concerns. There is only stillness, and it is within that stillness that you can uncover peace.
Do Meditation. If you do not meditate yet, you are missing out on a very important activity that can change your life. Meditating for 20 minutes daily can have an enormous impact in all areas of your life. If you have a lot on your mind and you feel like your thoughts are driving you crazy, meditation can help you find peace. Simply close everything, sit back, close your eyes, and clear your mind of every single thought. Focus on the emptiness. You will be surprised what a mere 20 minutes of meditation can do to turn things around for you. If you have trouble meditating yourself learn it and this will help you get used to this level of peacefulness.