He who doesn't know how to be a servant should never be allowed to be a master; the interests of public life are alien to anyone who is unable to enjoy others' successes, and such a person should never be entrusted with public affairs.
When he [the slothful person] is pressed to be diligent, either in his worldly affairs or in the business of religion, this is his excuse (and a sorry excuse it is as bad as none).