With regards to the student of knowledge being known as someone whose preoccupation is gaining knowledge and not the permissible differences that occur between the Muslims, Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah was asked:
Noble Shaykh, how would you advise the youth who are practising (their Religion) and amongst whom there has spread differing and bad feeling and hatred, and some of them make accusations against others of them – up to the point that they have forgotten their standing in front of Allaah, the Mighty and Majestic (on the Day of Judgment)?
I advise them with that which has preceded from my speech – that this (behaviour) is not from the affair of the Muslims.
Rather Allaah, the Most High, said to His Prophet Muhammad sall Allaahu ‘alaihi wa sallam:
Indeed those who divide their religion and became sects, then you have no concern with them at all. Their affair is only with Allaah who will inform them of what they used to do.
Soorah al An’aam (6) aayah 159
We do not deny that there will be differences occurring in the ummah; differing has been amongst the Islamic nation since the era of the Messenger ‘alaihissalaatu wassalaam.
However we do reject that this differing – that in which ijtihaad is allowed – should give rise to enmity and hatred, to the extent that your (own) brother from your mother and your father should become an enemy to you on the basis of this!
And I have already explained in the first part of (my) speech that this is the cause of time being wasted and barakah (blessing) being removed from one’s lifetime and knowledge and action.
And that it is befitting for a person that he busy himself with that which is of concern to him and which will benefit him.
And in the hadeeth that the Prophet sall Allaahu ‘alaihi wa ‘alaa aalihi wa sallam (said):
From the excellence of a person’s Islaam is that he leaves off that which does not concern him. 
(Quoted in Wasaayaa wa tawjeehaat li tullaab il ilm p91 of Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah, translated by Nasser ibn Najam)
 Reported by at Tirmidhee (2317) from the hadeeth of Aboo Hurayrah