We are such stuff that dreams are made on . . . the Tempest

You do look, my son, in a moved sort,
As if you were dismayed. Be cheerful, sir.
Our revels now are ended. These our actors,
As I foretold you, were all spirits and
Are melted into air, into thin air;
And, like the baseless fabric of this vision,
The cloud capped towers, the gorgeous palaces,
The solemn temples, the great globe itself,
Yea, all which it inherit, shall dissolve,
And, like this insubstantial pageant faded,
Leave not a rack behind. We are such stuff
As dreams are made on, and our little life
Is rounded with a sleep. 
(The Tempest, Act 4. Scene 1. Lines 146-58)

The Tempest Act 4, scene 1, 148–158