All of Rissho Kosei-kai's peace activities are based on the teachings in its basic scripture, the Lotus Sutra: Truth is universal and all religions are manifestations of it. All life springs from the same source, and thus all people are related and belong to one family. The Lotus Sutra declares that everyone is inherently imbued with the bodhisattva wish.

The organization's dedication to dialogue and cooperation with other religious and nonreligious organizations is a natural corollary of the teachings. That is why, ever since its founding, Rissho Kosei-kai has sought to cooperate with other religions and to work with the United Nations and variety of nongovernmental organizations (NGOs). Rissho Kosei-kai believes that true peace can come about only through such cooperation among groups and individuals.

Over the years Rissho Kosei-kai has sincerely engaged in such inter religious dialogue and cooperation for peace. In Japan, it is an active member of Shinsuren. Overseas, it works with the WCRP and the IARF.

In the late 1960s, Rissho Kosei-kai began to advocate the Brighter Society Movement, a public-spirited undertaking through which local Rissho Kosei-kai churches cooperate with local governments, welfare organizations, and voluntary services, organize special events, cosponsor lectures for young mothers, and coordinate activities to strengthen community solidarity and improve the quality of life.