“Let love steal in disguised as friendship.”
Book I, line 720; translated by J. Lewis May in The Love Books of Ovid, 1930
Variant translation: Love will enter cloaked in friendship's name.
Ars Amatoria (The Art of Love)
Original
Intret amicitiae nomine tectus amor.
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Ovid 120
Roman poet -43–17 BCRelated quotes

“Much that passes as idealism is disguised hatred or disguised love of power.”
1950s, What Desires Are Politically Important? (1950)
Context: I do not wish to seem to end upon a note of cynicism. I do not deny that there are better things than selfishness, and that some people achieve these things. I maintain, however, on the one hand, that there are few occasions upon which large bodies of men, such as politics is concerned with, can rise above selfishness, while, on the other hand, there are a very great many circumstances in which populations will fall below selfishness, if selfishness is interpreted as enlightened self-interest.
And among those occasions on which people fall below self-interest are most of the occasions on which they are convinced that they are acting from idealistic motives. Much that passes as idealism is disguised hatred or disguised love of power. When you see large masses of men swayed by what appear to be noble motives, it is as well to look below the surface and ask yourself what it is that makes these motives effective. It is partly because it is so easy to be taken in by a facade of nobility that a psychological inquiry, such as I have been attempting, is worth making. I would say, in conclusion, that if what I have said is right, the main thing needed to make the world happy is intelligence. And this, after all, is an optimistic conclusion, because intelligence is a thing that can be fostered by known methods of education.
“Love and friendship. They are what make us who we are, and what can change us, if we let them.”
Source: Something Blue
“Friendship often ends in love; but love in friendship—never.”
Vol. II; LXXXIII
Lacon

“Friendship often ends in love, but love in friendship - never.”

“A friendship that like love is warm;
A love like friendship, steady.”
How shall I woo?
Bartlett's Familiar Quotations, 10th ed. (1919)

“Friendship may, and often does, grow into love, but love never subsides into friendship.”
Quoted by Marguerite Gardiner, Countess of Blessington in Conversations of Lord Byron with the Countess of Blessington http://books.google.com/books?id=w648AAAAYAAJ&q="Friendship+may+and+often+does+grow+into+love+but+love+never+subsides+into+friendship"&pg=PA179#v=onepage (1834).

http://books.google.com/books?id=d8kCAAAAQAAJ&q=%22Because+friendship+is+intercommunication+of+love+therefore+where+love+is+not+mutual+there+can+be+no+friendship%22&pg=PA145#v=onepage
Car l'amitié est un amour mutuel, & s'il n'est mutuel, ce n'est pas amitié.
http://books.google.com/books?id=orIOAAAAQAAJ&q=%22car+l'amiti%C3%A9+est+un+amour+mutuel+%26+s'il+n'est+mutuel+ce+n'est+pas+amiti%C3%A9%22&pg=PA242#v=onepage
Pt. 3, ch. 17
Introduction to the Devout Life (1609)