He missed an invaluable opportunity to hold his tongue.
— Andrew Lang

Caution has its place, no doubt, but we cannot refuse our support to a serious venture which challenges the whole of the personality. If we oppose it, we are trying to suppress what is best in man --his daring and his aspirations. And should we succeed, we should only have stood in the way of that invaluable experience which might have given a meaning to life. What would have happened if Paul had allowed himself to be talked out of his journey to Damascus?
Carl Jung invaluable quote

Invaluable quotes
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Life for both sexes is arduous, difficult, a perpetual struggle. It calls for gigantic courage and strength. More than anything it calls for confidence in oneself. Without self-confidence we are as babes in the cradle. And how can we generate this imponderable quality, which is yet so invaluable, most quickly? By thinking that other people are inferior to oneself. By feeling that one has some innate superiority over other people.
— Virginia Woolf

What is a diary as a rule? A document useful to the person who keeps it. Dull to the contemporary who reads it and invaluable to the student, centuries afterwards, who treasures it.
— Helen Terry

The whole history of civilization is strewn with creeds and institutions which were invaluable at first, and deadly afterwards.
— invaluable quotation by Walter Bagehot