In Aere piscari, In Mare venari.

It is fishing in the air, or hunting in the sea, may be said to persons attempting things perfectly incompatible; as if those should expect to enjoy a perfectly retired and quiet life, who are engaged in any public offices or business; or happiness, while eagerly employed in the pursuit of sensual pleasure; or contentment, while anxiously intent on increasing their wealth which will be much more likely to add to their cares than to their comfort.