The Spirit of Faith series explores a range of topics - such as the unity of humanity, the eternal covenant of God, the promise of world peace, and much more - by taking an in-depth look at how the writings of the Bahá'í Faith view these issues. The series is designed to encourage readers of all faiths to think about spirituality, and to take time to pray and meditate on these important topics.

Sacrifice and Service - A compilation of writings and prayers that focus on sacrifice and service—subjects that are given great importance in the Bahá'í writings. The passages compiled here implore all people to make sacrifices and expend their energies in service to mankind as a means to improve the world of humanity and bring about its oneness.