The verse "But to-morrow at night you shall remain here;" from 2 Esdras 10:58 is spoken by the angel Uriel to Ezra. Understanding its meaning requires some context:

Context: Ezra is deeply distraught over the destruction of Jerusalem and the suffering of his people. He's been fasting and mourning, overwhelmed by grief and questioning God's justice. The angel Uriel has been sent to him to provide guidance and revelation. Throughout the book, Uriel answers Ezra's questions through riddles, parables, and visions.
The Verse's Significance: The verse is part of a larger conversation where Uriel instructs Ezra to go into a field. The instruction to "remain here to-morrow at night" signals a waiting period. The angel is essentially telling Ezra to prepare himself, both physically and spiritually, because something significant is about to happen.

Here are a few interpretations of the verse:

A Period of Preparation and Revelation: The verse strongly indicates that Ezra needs to prepare himself to receive a significant vision or revelation. The night often symbolizes a time of spiritual insight or challenge.
A Test of Patience and Faith: The waiting period could be a test of Ezra's patience and faith. Will he remain steadfast in his grief and questioning, or will he be open to the guidance that Uriel is offering?
Transition to a New Phase: The "to-morrow at night" signifies a transition. It marks the end of one phase (Ezra's despair) and the beginning of another (a period of enlightenment and renewed hope). The night is a transition from day to day.

In essence, the verse emphasizes the need for Ezra to remain grounded in the present moment and await God's timing. It suggests that a profound encounter is imminent and that Ezra must be ready to receive it. The "night" setting often implies a deeper, more spiritual, understanding is about to be revealed, contrasting with the plain light of day.