What is your opinion regarding a طالب علم (seeker of knowledge) who has been afflicted with entering pornographic websites, and despite his repeated attempts to abstain, he sometimes weakens? What is to be done, and is he fit for seeking knowledge?

Hasten to repentance and remorse, and protect yourself by getting married. If you are unable, then you must fast, for it curbs desire. Stay away from everything that incites desire, especially places of intermingling. Place the computer in a visible location and replace pornographic websites with websites of beneficial knowledge. Accompany righteous people so they can help you. Seeking knowledge encourages abandoning this habit, and it is one of the greatest good deeds, so do not prevent him from seeking knowledge; rather, encourage him in it. And let him know that the head of all knowledge is the fear of Allah.