Some themes encountered in the work of Emanuel Swedenborg
Heaven
Hell
Death
Love
Free Will
God
Truth
Use
Human Nature
The natural world
Reason
Wisdom
Self
Space and time
The finite and the infinite
The interaction between the soul and the body
States of mind
Perception
Symbolism, metaphor and allegory
Science
Mysticism
Belief
Faith
Existentialism
Dreams
Biology
Cosmology
Esotericism
Neoplatonism
Enlightenment
Romanticism
Transcendentalism
Please be aware that these are only suggestions! Feel free to pick another theme and use your imagination.
Read more on Swedenborg's life and ideas here