A human being is the sum total of his body, mind, soul, and spirit. The soul is not the same as spirit. The Latin root of the English word, spirit is spiritus, meaning "breath", but also "spirit, soul, courage, vigor."
The spirit is the inherent energy within a living being that cannot exist separate from the body. The soul on the other hand is regarded as eternal also believed to exist outside the body. In the Holy Bible, the soul and spirit are referred to in two different connotations in various verses.
The Modern Catholic Dictionary (John A. Hardon S.J.) defines spirit as: "That which is positively immaterial. It is pure spirit if it has no dependence on matter either for its existence or for any of its activities...." The soul is defined as: "The spiritual immortal part in human beings that animates their body. Though a substance (Catholic Encyclopedia: Substance) in itself, the soul is naturally ordained toward a body; separated it is an "incomplete" substance."
In Buddhism, devas are spirits or non-human beings that reside in the heavens as the result of good karma.
In the context of Siddhartha, the term pure spirit denotes a good individual with compassion, seeking truth and knowledge. A pure spirited individual, by virtue of the goodness within radiates with calm, peace and vibrancy.