In this paper I discuss whether Lehrer`s theory of justification is able to overcome the isolation problem which purpots to show the internal relations do not guarantee truth about the world. Lehrer defends his coherence theory by claiming that our acceptance system contains not only what we accept about the external world but what we accept about our relationship to that world, including what we accept about the conditions under which we are reliable or trustworthy. This is to say that complete justification involves the reliability of the acceptance system and the acceptance of the reliability. I argue that Lehrer`s defense in not successful.