“The poor and middle class buy luxuries with their own sweat, blood and children’s inheritance.”

A statement sometimes attributed to him, and also, more plausibly, to the first Baron Rothschild (as one of 1871); as quoted in Heads I Win, Tails I Win: Why Smart Investors Fail and How to Tilt the Odds in Your Favour (2016) by Spencer Jakab, p. 221
Variants:
When there's blood in the streets it's time to buy.
As quoted in Inside Man (2006)
Disputed

Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!

Definitions

Source: Rule 34 (2011), Chapter 8, “Anwar: Diplomat” (p. 93)

Chartism: An Introductory Essay (1929), p. 85

Letter (3 March 1944), later published in War As I Knew It (1947) Similar expressions were also used in his famous "Speech to the Third Army" in June 1944. The phrase is similar to one attributed to Erwin Rommel, "Sweat saves blood, blood saves lives, and brains saves both", and to an even older one by August Willich: "A drop of sweat on the drill ground will save many drops of blood on the battlefield" from The Army: Standing Army or National Army? (1866)

Source: The Myth of Male Power (1993), Part 1: The Myth of Male Power, p. 40.

1-Oct-2005, Radio Derby
A good washing powder was required after the game.