Note to Hamlet, 3.4.85-88: "proclaim no shame / When the compulsive ardor gives the charge, / Since frost itself as actively doth burn / And reason panders will"

proclaim no shame / When the compulsive ardor gives the charge, / Since frost itself as actively doth burn / And reason panders will: i.e., do not call it shameful when the irresistible desires (of the young) sends them charging into lustful action, since frost itself burns just as actively, and reason acts as a pander for the will. — Hamlet is being bitterly sarcastic, and by "frost itself" he means his mother, whom he considers too old to have sexual desires. Hamlet also believes that reason should act as the guide to the will, rather than pandering to it by giving it superficially reasonable reasons for doing what it desires to do.