Pantheism identifies the Universe and nature as all or part of the ultimate reality. It is not quite theism, and not quite atheism, although pantheist thought generally is on the borderline of both. Some scholars feel that pantheism is belief in God, but that God to pantheists is not like the God with personality and certain qualities that is part of traditional theistic thought.
The term pantheism was first used in the 1700s, although pantheistic thought has definitely been around throughout history. Some people attribute various philosophies throughout the West and East as having pantheistic qualities.
Note: The people quoted here are not necessarily pantheists
God is everything, and everything is God.
Baruch Spinoza a.k.a. Benedict de Spinoza
(1632-1677) Jewish/Pantheist Dutch philosopher and theologian
The more we understand individual things, the more we understand God.
All things which are, are in God. Besides God there can be no substance, that is, nothing in itself external to God.
The more you understand yourself and your emotions, the more you necessarily love God.
(1822-1888) English writer
All things seem to have what we call a law of their beings; whether we call this God or not is a matter of choice.
(1837-1921) American writer and naturalist
Can we describe form to infinite space? No more than we ascribe personality to God.
Joy in the universe, and keen curiosity about it all—that has been my religion.
Frank Lloyd Wright
(1869-1959) American architect and writer
I believe in God, only I spell it Nature.
(1876-1973) Legendary Spanish cellist and conductor
God, Nature. I call God Nature, or Nature God. And then comes this other thought: I am a miracle that God or Nature has made.
Hazrat Inayat Khan
(1882-1927) Indian Sufi teacher who is accredited with bringing Sufism to the West
The lover of nature is the true worshipper of God.
There is no greater scripture than nature, for nature is life itself.
(1934-1996) American astronomer and legendary science writer
But if by “God” one means the set of physical laws that govern the universe, then clearly there is such a God. This God is emotionally unsatisfying... It does not make much sense to pray to the law of gravity.