We know what we are, but not what we may be

 “The fault, dear Brutus, is not in our stars, but in ourselves.”

― William Shakespeare, Julius Caesar

“There is nothing either good or bad, but thinking makes it so.”
― William Shakespear, Hamlet

“This above all: to thine own self be true,
And it must follow, as the night the day,
Thou canst not then be false to any man.”
― William Shakespeare, Hamlet

“It is not in the stars to hold our destiny but in ourselves.”
― William Shakespeare

“If music be the food of love, play on,
Give me excess of it; that surfeiting,
The appetite may sicken, and so die.”
― William Shakespeare, Twelfth Night

“When he shall die,
Take him and cut him out in little stars,
And he will make the face of heaven so fine
That all the world will be in love with night
And pay no worship to the garish sun.”
― William Shakespeare, Romeo and Juliet

“We know what we are, but not what we may be.”
― William Shakespeare

“All the world's a stage,
And all the men and women merely players;
They have their exits and their entrances;
And one man in his time plays many parts,
His acts being seven ages.”
― William Shakespeare, As You Like It