Belief in the supernatural.
A main point of the Romantic era was the idea of intense emotional expression and the individual self, however it also dealt with an interest in supernatural interest and mysticism. There is a lot of influence from greek and roman mythology and the power of supernatural forces, so this makes the most sense.
The next soliloquy Hamlet has after seeing the ghost of his father is in Act II, Scene ii after the players, Rosencrantz and Guildenstern, have left him alone. In this soliloquy ("what a rogue and peasant slave am I"), Hamlet expresses his frustration with the fact that the actor could create tears in an instant about a fictional character, but he has lost his actual father and cannot even do anything about it. Through this he also decides on the plan to try and catch Claudius' guilt.
The statement that best describes the symbolic and figurative meaning in the first line from the excerpt is; The speaker feels that he will someday trade places and reap while others plant.