For peace we need unity. For unity, we need to heed His counsels.

The well-being of mankind, its peace and security, are unattainable unless and until its unity is firmly established. This unity can never be achieved so long as the counsels which the Pen of the Most High hath revealed are suffered to pass unheeded.

Baha'u'llah, Gleanings from the Writings of Baha'u'llah, p. 286