 The master mentioned the preponderance of this method over the others because it is more reliable and nobler. That is because the more excellent of demonstrations is one that yields certainty and it is the inference from the cause to the effect; however, its opposite which is the inference from the effect to the cause may yield certainty and that is if the thing sought has a cause that can only be discerned through it as has been explained in apodeixis. These two levels are posed in his saying — exalted is He: ‘We shall show them our signs in the horizons and in their souls until it is clear to them that He is the Truth. Is it not enough that your Lord is witness for everything?’ [Q. 41:52] (Avicenna, al-Isharat wa-l-tanbihat, Qum, 1996, III: 66-7).