Which phrases in this excerpt from act iii, scene i, of hamlet show shakespeare's use of similes?

if thou dost marry, i'll give thee this plague for thy dowry. be thou as chaste as ice, as pure as snow, thou shalt not escape calumny. get thee to a nunnery, go. farewell. or, if thou wilt needs marry, marry a fool, for wise men know well enough what monsters you make of them. to a nunnery, go, and quickly too. farewell.