Adversity.

Sweet are the uses of adversity,
Which, like the toad, ugly and venomous,
Wears yet a precious jewel in his head.

As You Like It — II. 1.

That, Sir, which serves and seeks for gain,
And follows but for form,
Will pack, when it begins to rain,
And leave thee in the storm.

King Lear — II. 4.

Ah! when the means are gone, that buy this praise,
The breath is gone whereof this praise is made:
Feast won—fast lost; one cloud of winter showers,
These flies are couched.

Timon of Athens — II. 2.