The more there is of mine, the less there is of yours

'Very true,' said the Duchess: 'flamingoes and mustard both bite. And the moral of that is—"Birds of a feather flock together."'
'Only mustard isn't a bird,' Alice remarked.
'Right, as usual,' said the Duchess: 'what a clear way you have of putting things!'
'It's a mineral, I THINK,' said Alice.
'Of course it is,' said the Duchess, who seemed ready to agree to everything that Alice said; 'there's a large mustard-mine near here. And the moral of that is—"The more there is of mine, the less there is of yours."'