Fear creating reality

The poem "when I have fears..." suggests that by being afraid of losing something valuable such as a lover or one's own life a person actually creates the circumstance by which they lose these things. Keats suggests that instead of being afraid of pain and paralyzed by its possibility a person should actually embrace pain. Without that embrace one runs the risk of becoming a person so focused on guarding their life that they lose it and everything it had to offer them. A similar suggestion of acceptance is put forth in "Ode to Melancholy". He makes the classic argument of bad experiences making the good that much more worthwhile.