Imaam al-Hasan al-Basri [rahimahullaah] said:
I swear by the One [i.e. Allaah] besides Whom none has the right to be worshipped, the Sunnah is the middle path between the extremist and the negligent one; therefore be patient upon it [i.e. the Sunnah] and may Allaah have mercy upon you. Indeed Ahlus Sunnah were the fewest people in the past and they will be the fewest in the future- those who neither agreed with the people of transgression and corruption in their transgression and corruption nor with the people of Bidah in their Bidah, [rather] they were patient upon the Sunnah until they met their Lord; therefore –by the will of Allaah- be like that.
[Sunan Ad-Daarimi Number 235]