“Never do a thing concerning the rectitude of which you are in doubt.”
            Letter 18, 5. 
Letters, Book I
        
Original
Quod dubites, ne feceris.
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Pliny the Younger 50
Roman writer 61–113Related quotes
                                
                                    “Living is
a thing you do
now or never —
which do you?”
                                
                                
                                
                                
                            
                                        
                                        Living Is — 
Grooks
                                    
Source: Thomas Paine From 'The Gods and Other Lectures'
The Gospel in a Pluralist Society. Eerdmans, 1989 (reprinted 2002),19.
                                
                                    “From the Divine, Eternal Spirit springs
Order and Rule and Rectitude of Things”
                                
                                
                                
                                
                            
                                        
                                        The True Grounds Of Eternal And Immutable Rectitude" St. 6 
Miscellaneous Poems (1773) 
Context: From the Divine, Eternal Spirit springs
Order and Rule and Rectitude of Things,
Thro' outward Nature, His Apparent Throne,
Visibly seen, intelligibly known, —
Proofs of a Boundless Pow'r, a Wisdom's Aid,
By Goodness us'd, Eternal and Unmade.
                                    
Lillian Moller Gilbreth (1962) Conference and Convention Proceedings American Institute of Industrial Engineers. p. 21.
“Do you know, a horrible thing has happened to me. I have begun to doubt Tennyson.”
                                        
                                        Letter to A.W.M. Baillie (10 September 1864) 
Letters, etc