In King Cambyses' vein.

William Shakespeare (1564-1616): King Henry IV. Part I. Act ii. Sc. 4.

Thou troublest me; I am not in the vein.

William Shakespeare (1564-1616): King Richard III. Act iv. Sc. 2.

O fair undress, best dress! it checks no vein,

But every flowing limb in pleasure drowns,

And heightens ease with grace.

James Thomson (1700-1748): The Castle of Indolence. Canto i. Stanza 26.

This is Ercles' vein.

William Shakespeare (1564-1616): A Midsummer Night's Dream. Act i. Sc. 2.

When thus the heart is in a vein

Of tender thought, the simplest strain

Can touch it with peculiar power.

Thomas Moore (1779-1852): Evenings in Greece. First Evening.