Usury is Against Intellect and Shari’a
The verse of Surah al-Baqarah which is quoted above, says that those who take usury (interest on loan) shall be counted among mad people (whom Shaitan has touched). On the Day of Judgement people will recognize them from their madness that they had been taking usury. Their sanity would be destroyed, because in this world they have acted against intellect and Shari’a.
They have been oblivious of humanity and the needs of humanity. They did not deal equitably with others and disobeyed the law of co-operation. Actually these people had been insane in the world, because they have followed the direction of Shaitan and performed such insane acts.