Question

"A little more than kin, and less than kind."
"Seems, madam? Nay it is. I know not "seems."
"O, that this too, too solid flesh would melt"
"Frailty, thy name is woman!"
"This above all: to thine own self be true."

These quotes are from Hamlet. I can't quite figure out what they mean, and their reference to the drama of the play. Can anybody help? Best answer gets a medal! :)