WHAT IS REAL?
To the man whose mind is occupied exclusively with the things of the natural world, the spiritual world seems only imaginary, a "myth." The natural man in everyone doubts the reality of the spiritual world and life after death. Although everyone is living in the spiritual world as to his spirit, we are not conscious of the things which appear in the spiritual realm until after the death of the physical body.
Spiritual Reality
I have knowledge what would otherwise be unknown and unknowable because Baha'u'llah had that knowledge.
Baha'u'llah did not reveal everything He knew, so I do not know everything He knew, but I have knowledge of whatever He chose to reveal. That means I know that there is an afterlife, but I do not know the nature of the afterlife, because Baha'u'llah chose not to reveal that for reasons He stated.
“Death proffereth unto every confident believer the cup that is life indeed. It bestoweth joy, and is the bearer of gladness. It conferreth the gift of everlasting life.
As to those that have tasted of the fruit of man’s earthly existence, which is the recognition of the one true God, exalted be His glory, their life hereafter is such as We are unable to describe. The knowledge thereof is with God, alone, the Lord of all worlds.” Gleanings From the Writings of Bahá’u’lláh, pp. 345-346