meekness means a peaceful heart

"It is spoken of as the happiness of the meek, that they 'delight themselves in the abundance of peace;' others may delight themselves in the abundance of wealth, a poor delight, that is interwoven with so much trouble and disquietude; but the meek, though they have but a little wealth, have peace, abundance of peace, peace like a river, and this such as they have a heart to enjoy."