Thy demon, that's thy spirit which keeps thee, is Noble, courageous high, unmatchable, Where Caesar's is not; but, near him, thy angel Becomes a fear, as being o'erpower'd: therefore Make space enough between you.
Your spirit, which controls you, is Noble, brave, high, and unbeatable, While Caesar's is not; but when you're near him, your angel Becomes a fear, as if it's overpowered: so Keep some distance between you.
First Soldier · Act 2, Scene 3
The Soothsayer warns Antony that his spirit loses power in Caesar's presence, that proximity to the younger man drains him. Antony does not heed the warning, and the play proves the Soothsayer right. The line articulates the play's tragic mathematics: Antony is the greater man, but Caesar is the future, and proximity to the new age makes the old hero wither.