who had sneaked in to spy out

The scary thing about Matt13 and the tares parable is this realization: those tares are NOT nouns but pronouns. Those stumbling blocks are people. Those seeds from the liar are people. Those obstructions to salvation for others are people. Liar can send the howlers. Liar can send the lions. But liar can also send people. You're not always looking for the wolf in the sheepfold, but for another sheep sent by the wrong one. Alot harder to spot the liar's worker when he's sitting across from you with a smile and a latte.