Bringing two different things together with an explicit word, such as "like", "just as" or "seems". Unlike metaphor, comparison makes it visible that these are two things.
In Paradise
for this reason doubt is born, like a shoot, at the foot of the true; and it is nature that pushes us up to the summit from hill to hill
Doubt is born "like a shoot", like a sprout at the foot of the plant. The "like" opens the image and links asking to growing, so that doubt appears as part of the nature of knowing, not as a failure.
Cantos I to IV: The Moon, Dante, to Beatrice, explaining why he asks
be, Christians, more serious as you move; do not be like a feather in every wind, nor believe that every water washes you
Cantos V to VIII: Mercury and Venus, Beatrice, at the end of the lesson on the vow
diverse voices make sweet notes; so the diverse seats in our life make sweet harmony among these wheels
and let this always be lead at your feet, to make you move slowly like a weary man, as much toward the yes as toward the no that you do not see
Cantos XIII to XVI: The Sun and Mars, Thomas Aquinas, to Dante, after explaining Solomon's measure
I well perceived that it was of high praise, for there came to me "Resurge" and "Conquer" like one who does not understand but hears
Cantos XIII to XVI: The Sun and Mars, Dante, narrator, hearing the hymn of the cross of Mars
all your things have their death, as you do; but this is hidden in some that last long, and lives are short. And as the turning of the sky of the moon covers and uncovers the shores without pause, so does Fortune with Florence
Cantos XIII to XVI: The Sun and Mars, Cacciaguida, to Dante, speaking of families and cities
as Hippolytus left Athens because of the pitiless and perfidious stepmother, so it behooves you to leave Florence
Cantos XVII to XX: The prophecy and the Eagle, Cacciaguida, to Dante, announcing the exile
from here on my sight was greater than the speech shows, which yields to such a vision, and memory yields to so great an excess. As one who in dreaming sees, whose impressed emotion remains after the dream, while the rest does not return to the mind
Cantos XXIX to XXXIII: The Empyrean, Dante, narrator, at the beginning of the final vision
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