Here's my attempt to narrow it down to five:
i. Not a whit, we defy augury. There is special providence in
the fall of a sparrow. If it be now, 'tis not to come; if it be not to
come, it will be now; if it be not now, yet it will come—the
readiness is all. Since no man, of aught he leaves, knows what is't
to leave betimes, let be. (Hamlet to Horatio)
ii. Ha, ha! keep time: how sour sweet music is,
When time is broke and no proportion kept!
So is it in the music of men's lives.
And here have I the daintiness of ear
To cheque time broke in a disorder'd string;
But for the concord of my state and time
Had not an ear to hear my true time broke.
I wasted time, and now doth time waste me; ... (Richard in prison)
iii. 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-capp'd 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. (Prospero after the feast)
iv. When we are born, we cry that we are come
To this great stage of fools: ... (Mad Lear to Gloucester) or
'Tis the times' plague, when madmen lead the blind. (Gloucester to Old Man)
v. I'll so offend, to make offence a skill;
Redeeming time when men think least I will. (Prince Hal to his audience)