The spiritual world is like unto the phenomenal world. They are the exact counterpart of each other. Whatever objects appear in this world of existence are the outer pictures of the world of heaven. When we look upon the phenomenal world, we perceive that it is divided into four seasons; one is the season of spring, another the season of summer, another autumn and then these three seasons are followed by winter. When the season of spring appears in the arena of existence, the whole world is rejuvenated and finds new life. The soul-refreshing breeze is wafted from every direction; the soul-quickening bounty is everywhere; the cloud of mercy showers down its rain, and the sun shines upon everything. Day by day we perceive that the signs of vegetation are all about us. Wonderful flowers, hyacinths and roses perfume the nostrils. The trees are full of leaves and blossoms, and the blossoms are followed by fruit. The spring and summer are followed by autumn and winter. The flowers wither and are no more; the leaves turn gray and life has gone. Then comes another springtime; the former springtime is renewed; again a new life stirs within everything.
The appearances of the Manifestations of God are the divine springtime. (‘Abdu’l-Baha, from a talk, 13 April 1912, New York; ‘The Promulgation of Universal Peace’)