St. Nilus of Sinai: At times during vigil one should read the psalms quickly...

At times during vigil one should read the psalms quickly, while at other times it is best to intone them. 

We should vary the method to oppose the wiles of the enemies, who at times incite us to hurry our tongue in quick reading, because the soul is sunk in depression, and at times incite us to stately intoning.'

St. Nilus of Sinai