Can anything be more thoughtless than the judgement of those men who boast of their forethought? They keep themselves inordinately busy with the task of how they may be able to live better, but they use up life in preparing themselves for life. They organise their thoughts with the distant future in mind; but the greatest waste of life consists in postponement: that is what takes away each day as it comes, that is what snatches away the present while promising something to follow. The greatest obstacle to living is expectation, which depends on tomorrow and wastes today.

Seneca, ‘On the Shortness of Life’