indeed allah does not for the sake of explanation shy to illustrate an example of anything whether it is of a gnat or something further than it so the believers know it is the truth from their lord as for the disbelievers they say what does allah intend by such an example? he misleads many thereby and he guides many thereby and with it he misleads only those who are rebellious.
إن الله لا يستحيي أن يضرب مثلا ما بعوضة فما فوقها فأما الذين آمنوا فيعلمون أنه الحق من ربهم وأما الذين كفروا فيقولون ماذا أراد الله بهذا مثلا يضل به كثيرا ويهدي به كثيرا وما يضل به إلا الفاسقين