Ek Oankar Wahiguru Ji Ki Fateh
Since first Nank till this date Sikhs have one Guru and That is Akal or eternal God.And verbal manifestation of Akal which guides us in the form of Gurubani(voice or views of Guru(Barakal)).
There is no God but Akal.There is no Guru but Akal,There is one else in universe but Akal.
Sat Shri Akal.
Truth (is) Respected/only wealth Eternal(only).