Spiritual Science is the knowledge of Conscious Energy called Spirit.
It is the study of the reality of spirit.
Science means being scient or knowing.
Modern Science studies & expands its knowledge of the physical world.
Spiritual Science requires the art of intuitive knowing.
Intuitive knowing is a spiritual sense.
It is the awareness of a sense of what is beyond or behind physical form.
Intuitive senses of seeing, feeling & knowing are extra sensory perceptions additional to the five physical senses of sight, hearing, smell, taste & touch.
Being scient is an intuitive knowing that is an energetic awareness of a spiritual reality. Omniscient means all knowing.
Gnostics are ancient spiritual scientists.
Alchemists are medieval spiritual scientists.
Astrologers are modern day spiritual scientists.
Metaphysicists are future spiritual scientists.
They all have their own philosophy of spiritual science.