Vladimir Solovyov
The metaphor of Christianity compared to one body breathing with two lungs was coined by the Russian poet and philosopher [[Vyacheslav Ivanov (poet)|Vyacheslav Ivanov]], inspired by the worldview of the 19th century Russian philosopher [[Vladimir Solovyov (philosopher)|Vladimir Solovyov]]. Solovyov "felt that eastern Christians could learn from the Western church's relatively active presence in the world."