How Can Spiritual Life Be A Science

“And as far as disease and old age are concerned, everyone gets practical experience. No one wants to be diseased, and no one wants to become old, but there is no avoiding these. Unless we have a pessimistic view of this material life, considering the distresses of birth, death, old age and disease, there is no impetus for our making advancement in spiritual life.” (Shrila Prabhupada, Bhagavad-gita, 13.8-12 Purport)