Preserve the mean; the opportune moment is best in all things. Hesiod
Thou wast indeed fortunate, Agricola, not only in the splendour of thy life, but in the opportune moment of thy death. Tacitus
IBM scientist Murray Campbell from the Deep Blue team revealed that the "extremely human move” in the chess game against Gary Kasparov was actually a bug in the program that was later fixed. What an opportune moment for a computer to evince that "To err is human!”. Newton Lee
The FBI may decide to leave a suspected mole undisturbed for years in order to feed him false critical information at an opportune moment or to use him to catch a bigger fish. Newton Lee
She had that rare virtue of never existing completely except for that opportune moment. Gabriel García Márquez