It is a maxim universally agreed upon in agriculture, that nothing must be done too late; and again, that everything must be done at its proper season; while there is a third precept which reminds us that opportunities lost can never be regained. Pliny the Elder
The name of freedom regained is sweet to hear. Livy
Innocence lost is not easily regained. The designer simply cannot predict the problems people will have, the misinterpretations that will arise, and the errors that will get made. Donald Norman
Freedom suppressed and again regained bites with keener fangs than freedom never endangered. Cicero
We have found that where science has progressed the farthest, the mind has but regained from nature that which the mind put into nature. Arthur Eddington
Hours once lost cannot be regained. Yugoslav Proverb