Paraphrase of words from hymn 962 in the 1889 Methodist Hymnal. The word "ere" is a poetic form of the word "before". So the phrase refers to the ending of a worship service.
Unbelievers can worship but when and if they do they cease being non-believers unless they worship their unbelief.
"too like the lightning, which doth cease to be ere one can say 'It lightens' "
"Too like the lightning, which doth cease to be ere one can say "It lightens"
It's you
ere
Juliet is comparing the short-lived nature of lightning to the sudden arrival of love that fades quickly. She is emphasizing the fleeting and unpredictable nature of romantic feelings.
Before the sun sets
'Favent' is the third person singular form of 'faveo, -ere.' 'Faveo, -ere' means to favor, befriend or to support.
cease the
To be annoyed, to dislike, to regret, to repent.
"Cease" means to stop. "Determine" can mean a number of things, including to find out, to set limits for, to define, or to stop.
Worship that is not in public.