“Stealing from capitalism is not like stealing out of our own pockets. Marx and Lenin have taught us that anything is ethical, so long as it is in the interest of the proletarian class and its world revolution.”

2014, 25th Anniversary of Polish Freedom Day Speech (June 2014)
Context: Our democracies must be defined not by what or who we’re against, but by a politics of inclusion and tolerance that welcomes all our citizens. Our economies must deliver a broader prosperity that creates more opportunity -- across Europe and across the world -- especially for young people. Leaders must uphold the public trust and stand against corruption, not steal from the pockets of their own people. Our societies must embrace a greater justice that recognizes the inherent dignity of every human being. And as we’ve been reminded by Russia’s aggression in Ukraine, our free nations cannot be complacent in pursuit of the vision we share -- a Europe that is whole and free and at peace. We have to work for that. We have to stand with those who seek freedom.

Quoted in: Thought. Vol. 17 (1965). p. 154.
The magazine further commented:
Picasso's remark — "When there's anything to steal, I steal" — was fair warning to the competition. In modern art he has been, for years, the cock-of- the-walk, (The broody hens, one supposes, are also part of that picture.) But the book is valuable, primarily, for Picasso's observations about his own work and the work of others.
1960s

UTI interview (2004)
Context: The law about what is stealing is very clear. Stealing is taking something away from someone so they cannot use it. There’s no way that making a copy of something is stealing under that definition.
If you make a copy of something, you’ll be prosecuted for copyright infringement or something similar — not larceny (the legal term for stealing). Stealing, like piracy and intellectual property, is another one of those terms cooked up to make us think of intellectual works the same way we think of physical items. But the two are very different.
You can’t just punish people because they took away a “potential sale”. Earthquakes take away potential sales, as do libraries and rental stores and negative reviews. Competitors also take away potential sales.

Source: I Put a Spell on You: The Autobiography of Nina Simone

Source: A Face Like Glass

"Cultural Marxism Is an Oxymoron" http://www.garynorth.com/public/12623.cfm (1 July 2014), Gary North.

Source: "How to Be a Good Communist - 4. The Unity of Theoretical Study and Ideological Self-Cultivation" https://www.marxists.org/reference/archive/liu-shaoqi/1939/how-to-be/ch04.htm (July 1939)

Source: An Essay on Old Age, 1732, p. 136