"All that glitters is not gold"
May be good on the surface, but might not be good when you look closely
It's Greek to me.
Something that is difficult of impossible to understand
To be, or not to be, that is the question.
Should we endure hardship or escape it?
"All the world’s a stage, and all the men and women merely players;"
Life is like a drama played out on stage
Give the devil his due
Love looks not with the eyes, but with the mind.
Break the ice
Say or do something that makes people feel more comfortable.
There is "Method in his madness".
There is reason behind someone's behavior even if you don't understand it at first.
Tomorrow, and tomorrow and tomorrow.
green-eyed monster
jealousy / feeling jealous of someone
The course of true love never did run smooth.
Love is not easy. / Loving someone is not easy.
Be great in act, as you have been in thought.
Act accordingly and put effort in making things happen.
To thine own self be true
Stay true to yourself, your principles, and to who you are.
wear one's heart on one's sleeve
openly show your emotions / not hiding your feelings
Jesters do oft prove prophets.