What are Romeo's qualities in Shakespeare's Romeo and Juliet, and what quotes describe these qualities?

One thing we
know about Romeo is that he is a sincere
person. We see his quality of sincerity in
the very first scene. First, we learn from his father that
Romeo is feeling genuinely, deeply, sincerely grieved over some
matter. We know of his sincerity because he has been seen staying out all
night and also seen crying each morning at dawn while standing in a certain part of
town, under a certain grove of trees. Most likely, he stands all night long in the same
part of town where Rosaline lives, and the grove of trees offers a view of her house,
possibly his bedroom. His tears show us just how deeply and sincerely he has let
Rosaline's rejection affect him. Romeo's emotional state is appearing to be so sincerely
troubled that Lord Montague is afraid Romeo will do himself some harm if he keeps
rejecting counsel, as we see in Lord Montague's lines addressed to Benvolio, "Black and
portentous must this humour prove / Unless good counsel may the cause remove"
(I.i.137-38).

Romeo's sincerity also
shows when he first enters the scene and is sincerely troubled, even
frustrated and angered by the signs that there had been
another fight. He even rightly points out that the feud has
just as much to do with the two families' own love for themselves and their own ideals
as it has to do with the hatred each family feels for the other, as we see in his
lines:

O me!
What fray was here?
Yet tell me not, for I have heard it all.
Here's
much to do with hate, but more with love.
(171-73)

Another
one of his qualities is that he is generally virtuous, even
pious. Even Lord Capulet speaks of Romeo's reputation for being virtuous
when he commands Tybalt not to fight Romeo at the ball, saying, "Verona brags of him /
To be a virtuous and well-govern'd youth" (I.v.70-71). We especially see Romeo's
virtuous and pious mind when we see him feeling such deep regret and
remorse in the final scene over killing both Tybalt and
Paris. He shows feelings of regret over killing Paris when he says to his
corpse, "O, give me thy hand ... I'll bury thee in a triumphant grave" (V.iii.81-83).
Shaking hands is a sign of forgiveness and mutual respect. Therefore, by asking the dead
Paris for his hand, he is asking him for his forgiveness. He even asks the dead Tybalt
for his forgiveness, again showing us Romeo's virtuous and pious
mind.