Example: "I'll be with you in spirit."
Meaning: I support your endeavour in principle, but cannot join you in it.
Biblical Meaning: A sort of astral projection, where one can view proceedings from afar.
2 Kings 6:12
And one of his servants said, None, my lord, O king: but Elisha, the prophet that is in Israel, telleth the king of Israel the words that thou speakest in thy bedchamber.
1 Cor. 5:4
In the name of our Lord Jesus Christ, when ye are gathered together, and my spirit, with the power of our Lord Jesus Christ,