"Purchased even down, for sale even rise" is a common adage in Forex business. It means that traders should buy currency pairs when they are at or near their support levels, or when they are oversold, and sell them when they are at or near their resistance levels, or when they are overbought. This strategy helps traders buy low and sell high, maximizing profits while minimizing potential losses. It's important to note that this strategy should be used in conjunction with technical analysis and a solid risk management strategy to minimize risks and increase profitability.