What is the meaning of [Praise the day at sunset]

“Make sure a matter is really over before relaxing about it. Unforeseen unfavourable developments may intervene and change the expected final result.”,Paczolay, Gyula (1997). “X”. European proverbs; in 55 languages, with equivalents in Arabic, Persian, Sanskrit, Chinese and Japanese. Veszprémi Nyomda. p. 323. ISBN 1-875943-44-7.