A sage, instructing his students, said to them: ‘O darlings of your fathers, learn a trade because property and riches of the world are not to be relied upon; also silver and gold are an occasion of danger because either a thief may steal them at once or the owner spend them gradually; but a profession is a living fountain and permanent wealth; and although a professional man may lose riches, it does not matter because a profession is itself wealth and wherever he goes he will enjoy respect and sit in high places, whereas he who has no trade will glean crumbs and see hardships: [SA’ADI]