Matt Haig said this quote

This was the species whose main excuse for not doing something was 'if only I had more time'. Perfectly valid until you realised they did have more time. Not eternity, granted, but they had tomorrow. And the day after tomorrow. And the day after the day after tomorrow. In fact I would have to write 'the day after' thirty thousand times before a final 'tomorrow' in order to illustrate the amount of time on a humans hands.