“There is no real security except for whatever you build inside yourself.”
“You can't build a secure future on dishonest money.”
             Speech to Conservative Party Conference (11 October 1985) http://www.margaretthatcher.org/document/106145 
Second term as Prime Minister 
Context: We will not reflate... Past governments have tried that. Past governments have deliberately created inflation in the hope of reducing unemployment. It always finished up with worse inflation and worse unemployment. Mr President, You can't build a secure future on dishonest money. And there is a fundamental truth, from which no government can escape.
        
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Margaret Thatcher 348
British stateswoman and politician 1925–2013Related quotes
“You can't build a reputation on what you are going to do.”
                                        
                                        As quoted in International Encyclopedia of Prose and Poetical Quotations (1951) by William S. Walsh 
Attributed from posthumous publications 
Variant: You can't learn in school what the world is going to do next year.
                                    
“You got a lot of money but you can't afford the freeway”
                                        
                                        "Freeway" ·  Video https://www.youtube.com/watch?v=TQF5CXV9cos 
Song lyrics, @#%&*! Smilers (2008) 
Context: You know it
I know it
Why don't you
Just show it
You got a lot of money but you can't afford the freeway
                                    
“You can be young without money, but you can't be old without it.”
“You can't build a peaceful world on empty stomachs and human misery.”
From "Eat This!", an episode of Penn and Teller's Bullshit!; Quoted in: Gary Beene (2011) The Seeds We Sow: Kindness that Fed a Hungry World. p. 9
“Unfortunately, buildings are not like drawings. You can't just erase them.”
Source: As quoted in Meredith L. Clausen, "The Pan Am Building and the Shattering of the Modernist Dream" http://books.google.co.uk/books?id=E6qRuyzOogIC&pg=PA275&lpg=PA275&dq=%22Unfortunately,+buildings+are+not+like+drawings.+You+can%27t+just+erase+them.%22&source=bl&ots=wkwiw7U92A&sig=4fGIk_ufWMT3wv_c6l6k8uaYMv0&hl=en&sa=X&ei=HYlHVNHNJ4Lb7Aa86oHwCA&ved=0CCcQ6AEwAQ#v=onepage&q=%22Unfortunately%2C%20buildings%20are%20not%20like%20drawings.%20You%20can%27t%20just%20erase%20them.%22&f=false, p.275