Jamieson, Fausset & Brown

not cut down--Before it has ripened for the scythe, it withers more suddenly than any herb, having no self-sustaining power, once that the moisture is gone, which other herbs do not need in the same degree. So ruin seizes on the godless in the zenith of prosperity, more suddenly than on others who appear less firmly seated in their possessions [UMBREIT] (Psa 112:10).