ur definitely a problem <| sep |> I would point out , however , that there are varying standards of evidence for any given claim . If you say I have a cat , I ' m probably going to take your word for it simply because it isn ' t a claim made in a vacuum Cats are extremely popular pets and many , many people have one or more , if you ' re a crazy cat lady . You have a picture of angry cat as your flair , which suggests you like cats . It is not an extraordinary claim that you have a cat . All of these are evidence that you may , in fact , have a cat . Does it amount to proof proof , in this sense , meaning An overwhelming preponderance of evidence ? No . But keep in mind that evidence simply describes a fact that is in accordance with and in support of only one conclusion over any other . So I would say that we do have sufficient evidence to accept , tentatively , that you do in fact have a cat if you say so . And that accepting such a claim is fine unless evidence arises to the contrary for example , if we went to your house and found no cat . Or if someone you knew told us you did not in fact have a cat . If you were to say that your cat was not a house cat but actually a tiger , then that would be difference . Your say so would no longer be sufficient , because you ' re now making a much more extraordinary claim . Not all claims necessarily have the same requirements set for them , and often we are able to derive evidence simply from what we know about reality even if that evidence isn ' t contained in the statement itself .