A knife in a dream can point to a threat you sense but haven't named, or to a truth that feels sharp enough to cut through pretense. Holding the knife yourself often reflects a decision to cut ties with something, while facing one aimed at you may point to feeling exposed or attacked.
Jupiter should be asked for the accumulation of goods, conciliation of opinions, rejection of temptations, mitigation of grief and security of earthly and maritime paths. - Picatrix (Andalusia, ~1000.AD)