When analyzing a source, historians want to remain In other words, they don't want to be by their personal feelings and opinions. They know that different sources may reveal different.

When analyzing a source, historian has to remain unbiased and free from personal feelings and opinions. They know that there are different source of an event and they may reveal different facts which could cross-check his argument. The objective historiography is possible only when the historian is unbiased and when different sources like archaeological, literary and other sources are cross-checked and interpreted independently.