Book of Taliesin (c. 1275?), The Fold of the Bards 
Context: I am a harmonious one; I am a clear singer.
I am steel; I am a druid.
I am an artificer; I am a scientific one.
I am a serpent; I am love; I will indulge in feasting.
I am not a confused bard drivelling,
When songsters sing a song by memory,
They will not make wonderful cries;
May I be receiving them.
Like receiving clothes without a hand,
Like sinking in a lake without swimming
The stream boldly rises tumultuously in degree.
                                    
“I am I am I am.”
Source: The Bell Jar
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Sylvia Plath 342
American poet, novelist and short story writer 1932–1963Related quotes
                                
                                    “I am old. I am young. I am Gwion,
I am universal, I am possessed of penetrating wit.”
                                
                                
                                
                                
                            
                                        
                                        A tradition about Taliesin states that he was once a boy named "Gwion". 
Book of Taliesin (c. 1275?), The First Address of Taliesin
                                    
“If I am Sophocles, I am not mad; and if I am mad, I am not Sophocles.”
                                        
                                        Vit. Anon, page 64 (Plumptre's Trans.). 
Bartlett's Familiar Quotations, 10th ed. (1919)
                                    
Leaves Of Morya's Garden (1924 - 1925), Book I : The Call (1924)
                                        
                                        Message No. 10 
Messages from Maitreya the Christ (1981)
                                    
                                        
                                        47 : The Question and its Answer, p. 78. 
The Everything and the Nothing (1963)
                                    
“I am mountains that crush. I am waves that crash. I am storms that shatter. I am”
Source: The Hero of Ages
“I am a utilitarian. I am also a vegetarian. I am a vegetarian because I am a utilitarian.”
Utilitarianism and Vegetarianism, Philosophy & Public Affairs, 9(4): 325 (1980).