Happy birthday to Imam Kazem (peace be upon him) to the lovers of the Ahl al-Bayt of infallibility and purity (peace be upon them).
In a hadith from that Imam, it is narrated as follows:
God has two proofs over mankind: one manifest and one hidden. His manifest proof is the messengers, prophets, and imams, and His hidden proof is the intellect of human beings.