Baha'u'llah revealed Himself to a humanity who had "attained the stage of maturity."

 After all, Baha'u'llah revealed Himself to a humanity who had "attained the stage of maturity."

(Gleanings 33:2; see also Kita - b-i-Aqdas 149)

(Loyalty to the Covenant and Critical Thought - A Commentary by Udo Schaefer)

See also...

https://bahaitexts.blogspot.com/2018/07/hundreds-of-thousands-of-verses-written.html