“You need to understand that everything you do at the poker table, conveys information. You can't be all loosy goosy, eating a sandwich, or checking your phone.”
Daniel Negreanu Teaches Poker - from Masterclass.com
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Daniel Negreanu 2
Canadian poker player 1974Related quotes

The Ballot or the Bullet (1964), Speech in Cleveland, Ohio (April 3, 1964)
Context: I'm not going to sit at your table and watch you eat, with nothing on my plate, and call myself a diner. Sitting at the table doesn't make you a diner, unless you eat some of what's on that plate. Being here in America doesn't make you an American. Being born here in America doesn't make you an American. Why, if birth made you American, you wouldn't need any legislation; you wouldn't need any amendments to the Constitution; you wouldn't be faced with civil-rights filibustering in Washington, D. C., right now.

2010s, 2016 Democratic National Convention (2016)
Context: What I admire most about Hillary is that she never buckles under pressure. She never takes the easy way out. And Hillary Clinton has never quit on anything in her life. And when I think about the kind of president that I want for my girls and all our children, that is what I want. I want someone with the proven strength to persevere. Somebody who knows this job and takes it seriously. Somebody who understands that the issues of our nation are not black or white. It cannot be boiled down to 140 characters. Because when you have the nuclear codes at your fingertips and the military in your command, you can't make snap decisions. You can't have thin skin or a tendency to lash out. You need to be steady and measured and well informed.

Source: Death by Black Hole - And Other Cosmic Quandaries

“I can't do everything for you. You must walk alone to find your soul.”
Variant: You must walk alone to find your soul.
Source: Speak

Turning Tables, written by Adele and Ryan Tedder.
Song lyrics, 21 (2011)

“You can't learn everything you need to know legally.”
Source: A Widow for One Year (1998), part II, ch. 7

“5881. You can't eat your Cake, and have it too.”
Compare Poor Richard's Almanack (1744) : The same man cannot be both Friend and Flatterer.
Introductio ad prudentiam: Part II (1727), Gnomologia (1732)
Variant: 2592. I can't be your Friend, and your Flatterer too.

“You can't eat hope,' the woman said.
You can't eat it, but it sustains you,' the colonel replied.”
Source: El coronel no tiene quien le escriba