‘Abdu’l-Bahá said:

“There is nothing greater or more blessed than the Love of God!  It gives healing to the sick, balm to the wounded, joy and consolation to the whole world, and through it alone can man attain Life Everlasting. The essence of all religions is the Love of God, and it is the foundation of all the sacred teachings.”
(Paris Talks by ‘Abdu’l-Bahá, p. 82)

“I ask you all, each one of you, to follow well the light of truth, in the Holy Teachings, and God will strengthen you by His Holy Spirit so that you will be enabled to overcome the difficulties, and to destroy the prejudices which cause separation and hatred amongst the people. Let your hearts be filled with the great love of God, let it be felt by all; for every man is a servant of God, and all are entitled to a share of the Divine Bounty.”
(Paris Talks by ‘Abdu’l-Bahá, p. 27)

“The basis of the teaching of Bahá’u’lláh is the Unity of Mankind, and His greatest desire was that love and goodwill should live in the heart of men.”
(Paris Talks by ‘Abdu’l-Bahá, p. 45)

“The Heavenly Father gave the priceless gift of intelligence to man so that he might become a spiritual light, piercing the darkness of materiality, and bringing goodness and truth into the world. If ye will follow earnestly the teachings of Bahá’u’lláh, ye shall indeed become the light of the world, the soul for the body of the world, the comfort and help for humanity, and the source of salvation for the whole universe…”
(Paris Talks by ‘Abdu’l-Bahá, p. 113-114)

Bahá’u’lláh wrote:

“…in the kingdoms of earth and heaven there must needs be manifested a Being, an Essence Who shall act as a Manifestation and Vehicle for the transmission of the grace of the Divinity Itself, the Sovereign Lord of all.  Through the Teachings of this Day Star of Truth every man will advance and develop until he attaineth the station at which he can manifest all the potential forces with which his inmost true self hath been endowed…”
(Gleanings from the Writings of Bahá’u’lláh, p. 67-68)