in due time
Synonym discussion
Sense: idiom/1
'In due time' carries a patient, almost philosophical tone — the right moment will arrive naturally, without being forced. 'Eventually' is the plain, everyday alternative; it says something will happen but reveals nothing about whether the timing is fitting. 'In time' (without 'due') means 'not too late' — catching a train in time versus inheriting a house in due time. 'Sooner or later' emphasises inevitability with a casual shrug. 'When the time is right' shares the sense of natural appropriateness but feels more personal and deliberate — you might quit a draining job when the time is right, but the cherry trees will bloom in due time regardless of your plans.
Etymology
The phrase combines 'due' (from Latin 'debere', meaning 'to owe') with 'time'. In Middle English, 'due' came to mean 'proper, fitting, or owed by moral obligation'. By the 16th century, 'in due time' had settled into its modern meaning: something that will happen when the time is right, as if the right moment is something the world owes to the event.