If people refuse to accept Baha'u'llah, they will bring upon themselves crisis and great affliction.

If men refuse absolutely to take the easier road of faith, of seeking out God's Manifestation for this age and accepting Him, then they will bring upon themselves a fresh crisis in human affairs and very great affliction.

- Shoghi Effendi

https://bahai-library.com/shoghieffendi_unfolding_destiny#451