Is it permissible to read books of those who deviate in creed, or Sufis, or those who contradict the consensus of scholars? And is it valid to follow an opinion from them that contradicts the saying of a reputable scholar like Ibn Taymiyyah, given the apprehension in reading them and the necessity of seeking what is beneficial?

A beginner in seeking knowledge should not delve extensively into books of disagreement. Rather, he is obliged to read the books of reputable scholars who adhere to the Sunnah. Once he acquires the faculty of discernment, there is no harm in expanding his reading. It is not permissible to harbor ill thoughts about some dissenting scholars or to belittle their status due to certain disagreements, for they have great efforts and positive impacts. Their books should be read with caution regarding what scholars have pointed out concerning their disagreements. Ibn al-Qayyim said: "The great man who has a good standing and positive contributions in Islam, and who holds a significant position among Islam and its people, may commit a slip or an error for which he is excused, and even rewarded for his ijtihad (independent reasoning). Therefore, he should not be followed in it, nor should his status, leadership, and position in the hearts of Muslims be disregarded." Thus, not everyone who disagrees should be disliked or prevented from benefiting from. Shaykh al-Islam Ibn Taymiyyah is not infallible, and no one should be followed except the Prophet, peace and blessings be upon him. As for one who is capable of ijtihad or is a layman, he may take what he trusts.