Does a specialist have all the knowledge he needs related to his field? Will it suffice him forever? Obviously not! He needs research to stay in touch with the latest developments and findings. Because THERE IS NO LIMIT TO KNOWLEDGE! The more we learn about this universe, the more we realize how ignorant we are. There’s always someone who knows more than you. If not on this earth, then definitely in the heavens. :)
وفوق کل ذی علم علیم
..over all those endowed with knowledge is the All-Knowing (Allah). [Yusuf: 76]
Narrated Ibn ‘Abbas:
That he differed with Hur bin Qais bin Hisn Al-Fazari regarding the companion of (the Prophet) Moses. Ibn ‘Abbas said that he was Khadir. Meanwhile, Ubai bin Ka’b passed by them and Ibn ‘Abbas called him, saying “My friend (Hur) and I have differed regarding Moses’ companion whom Moses, asked the way to meet. Have you heard the Prophet mentioning something about him? He said, “Yes. I heard Allah’s Apostle saying, “While Moses was sitting in the company of some Israelites, a man came and asked him. “Do you know anyone who is more learned than you? Moses replied: “No.” So Allah sent the Divine Inspiration to Moses: ‘Yes, Our slave Khadir (is more learned than you.)’ Moses asked (Allah) how to meet him (Khadir). So Allah made the fish as a sign for him and he was told that when the fish was lost, he should return (to the place where he had lost it) and there he would meet him (Al-Khadir). So Moses went on looking for the sign of the fish in the sea. The servant-boy of Moses said to him: Do you remember when we betook ourselves to the rock, I indeed forgot the fish, none but Satan made me forget to remember it. On that Moses said: ‘That is what we have been seeking? (18.64) So they went back retracing their foot-steps, and found Khadir. (And) what happened further to them is narrated in the Holy Qur’an by Allah. (18.54 up to 18.82)
Lesson learnt. Never think you know best!