The Noble Shaykh Zayd al-Madkhalee (may Allah have mercy upon him) stated:
It is not befitting for the Muslims that their brotherhood/sisterhood is merely speech and smiling along with their being opposition in the hearts to which the tongues speak with. Rather, it is obligatory that their brother/sisterhood is truthful in that which is apparent and in that which is hidden. A believing brother/sister does not harbor hatred against his believing brothers/sisters. Even if there takes place between them that which takes place from the matters of differing/opposition in the attainment of personal affairs or the attainment of the worldly affairs, indeed these matters should not leave for him an opening to harbor hatred against his Muslim brothers/sisters and/or harbor bad thoughts and opinions about them. Rather, it is obligatory that he is one who is sincere in the matter of brotherhood/sisterhood and that he is truthful in it in order that the hearts unite and harmonize upon the truth.