Be wary of passing the judgment: obscure. To find something obscure poses no difficult, elephants and poodles find many things obscure. Georg Christoph Lichtenberg
Be wary of strong drink. It can make you shoot at tax collectors... and miss. Robert A. Heinlein
We should be wary of politicians who profess to follow history while only noticing those signposts of history that point in the direction which they themselves already favour. Douglas Hurd
Always be wary of any helpful item that weighs less than its operating manual. Terry Pratchett
Let us be wary of ready-made ideas about cowardice and courage: the same burden weighs infinitely more heavily on some shoulders than on others. François Mauriac
When you're enjoying prosperity, be wary of adversity. Sicilian Proverb