Another Stoic concept which offered inspiration to the Church was that of "divine Spirit". Cleanthes, wishing to give more explicit meaning to Zeno's "creative fire", had been the first to hit upon the term "pneuma", or "spirit", to describe it. Like fire, this intelligent "spirit" was imagined as a tenuous substance akin to a current of air or breath, but essentially possessing the quality of warmth; it was immanent in the universe as God, and in man as the soul and life-giving principle. Clearly it is not a long step from this to the "Holy Spirit" of Christian theology, the "Lord and Giver of life", visibly manifested as tongues of fire at Pentecost and ever since associated – in the Christian as in the Stoic mind – with the ideas of vital fire and beneficent warmth.