Who said it........

[Androndo the Thoughtfull]

ah, yes, The awnswer..... look here, friends - and if you don't believe me look in silmarillion in 'Of the Coming of the Elves and the Captivity of Melkor'

and
Yavanna spoke before the Valar, saying: 'Ye mighty of Arda, the Vision of
Iluvatar was brief and soon taken away, so that maybe we cannot guess within
a narrow count of days the hour appointed. Yet be sure of this: the hour
approaches, and within this age our hope shall be revealed, and the Children
shall awake.