"So in addition to purification of our wealth through charity (zakat), another meaning that stems from the root z-k-w is 'to grow'. The spreading of wealth, then, benefits the commonweal, while the hoarding of wealth blights it. It is worth noting that the word for pure gold in classical Arabic ('iqyan) is derived from the word for an infant's faeces (al-iqī). Wealth is like manure - when it is spread around, many things grow, but when it is hoarded, a great stench rises."