To attain inner peace you must actually give your life, not just your possessions. When you at last give your life -- bringing into alignment your beliefs and the way you live then, and only then, can you begin to find inner peace.
Until one nation ceases its attempts to dominate another, there will never be true freedom. Until one religion relinquishes its quest to prove its god superior to that of another, there shall never be world peace. We will never truly prosper or experience lasting harmony, until we refrain from preaching the gospel of our own moral values and our personal preferences by forcing it upon others.