The earth is but one country and mankind its citizens - Baháʼu'lláh

They who soar in the heaven of singleness and reach to the sea of the Absolute, reckon this city—which is the station of life in God—as the furthermost state of mystic knowers, and the farthest homeland of the lovers. But to this evanescent One of the mystic ocean, this station is the first gate of the heart's citadel, that is, man's first entrance to the city of the heart; and the heart is endowed with four stages, which would be recounted should a kindred soul be found

The utterance of God is a lamp, whose light is these words: Ye are the fruits of one tree, and the leaves of one branch. Deal ye one with another with the utmost love and harmony, with friendliness and fellowship. ... So powerful is the light of unity that it can illuminate the whole earth.

...for each day there is a new problem and for every problem an expedient solution.