Unless there is a return to religion, we will be seeing more and more people having nervous breakdowns. The answer is indicated by the text, He that believeth shall not make haste. The Hebrew for make haste may be translated fuss. He that believeth shall not fuss. The meaning is as when we speak of a person getting fussed up, or getting upset.
Some people are upset or fussed up nearly all the time.
They are of a nervous, restless disposition. Over the smallest matters they become excited, flustered, fretted. This unfits them for work. None of us can do his work efficiently in a feverish state of mind. Nothing hinders more in life than nervousness.