Dante Alighieri: Frasi in inglese (pagina 4)

Canto XXXIII, line 145 (tr. C. E. Norton).
The Divine Comedy (c. 1308–1321), Purgatorio

Canto V, lines 16–18 (tr. Sinclair).
The Divine Comedy (c. 1308–1321), Purgatorio

Canto XIV, lines 109–111 (tr. Longfellow).
The Divine Comedy (c. 1308–1321), Purgatorio

Canto XXVIII, lines 25–27 (tr. Longfellow).
The Divine Comedy (c. 1308–1321), Inferno

Canto III, lines 61–63 (tr. Mark Musa).
The Divine Comedy (c. 1308–1321), Inferno

Canto XXVII, lines 28–30 (tr. Sinclair).
The Divine Comedy (c. 1308–1321), Paradiso

Amor che ne la mente mi ragiona
de la mia donna disiosamente...
che lo 'ntelletto sovr'esse disvia.
Trattato Terzo, line 1.
Il Convivio (1304–1307)

Canto VIII, lines 111 (tr. Longfellow).
The Divine Comedy (c. 1308–1321), Inferno

Canto II, lines 1–3 (tr. Longfellow)
The Divine Comedy (c. 1308–1321), Inferno

Canto VIII, lines 1–6 (tr. Sinclair).
The Divine Comedy (c. 1308–1321), Purgatorio

Canto III, lines 59–60 (tr. Longfellow).
The decision of Pope Celestine V to abdicate the Papacy and allow Dante's enemy, Pope Boniface VIII, to gain power.
The Divine Comedy (c. 1308–1321), Inferno

Canto I, line 34 (tr. Sinclair).
The Divine Comedy (c. 1308–1321), Paradiso

Amore e 'l cor gentil sono una cosa...
e così esser l'un sanza l'altro osa
com'alma razional sanza ragione.
Origine: La Vita Nuova (1293), Chapter XVI (tr. Mark Musa)

Canto IV, lines 133–135 (tr. C. E. Norton).
The Divine Comedy (c. 1308–1321), Purgatorio

Henry Powell Spring in 1944; popularized by John F. Kennedy misquoting Dante (24 June 1963) http://www.bartleby.com/73/1211.html. Dante placed those who "non furon ribelli né fur fedeli" [were neither for nor against God] in a special region near the mouth of Hell; the lowest part of Hell, a lake of ice, was for traitors.
According to the John F. Kennedy Presidential Library & Museum http://www.jfklibrary.org/Research/Research-Aids/Ready-Reference/JFK-Quotations.aspx President Kennedy got his facts wrong. Dante never made this statement. The closest to what President Kennedy meant is in the Inferno where the souls in the ante-room of hell, who "lived without disgrace and without praise," and the coward angels, who did not rebel but did not resist the cohorts of Lucifer, are condemned to continually chase a banner that is forever changing course while being stung by wasps and horseflies.
See Canticle I (Inferno), Canto 3, vv 35-42 for the notion of neutrality and where JFK might have paraphrased from.
Misattributed

Canto XV, line 99 (tr. Clive James).
The Divine Comedy (c. 1308–1321), Inferno

Canto XXXIII, line 49 (tr. Longfellow).
The Divine Comedy (c. 1308–1321), Inferno

Canto V, lines 100–105 (tr. Sinclair).
The Divine Comedy (c. 1308–1321), Inferno

Canto XXII, lines 16–18 (tr. Longfellow).
The Divine Comedy (c. 1308–1321), Paradiso