The quotation argues that sound judgement is undermined by two forms of impulsiveness: acting too quickly and allowing strong emotion to dominate deliberation. Haste can prevent careful consideration of evidence and consequences, while passion can narrow attention and make alternative arguments harder to assess fairly.

In the History of the Peloponnesian War, the words appear in a speech attributed to Diodotus during the Mytilenean debate at Athens. He is defending the value of renewed discussion before the assembly makes a severe and irreversible decision. His argument treats deliberation not as a sign of weakness but as an essential part of responsible political judgement.

The wider principle applies beyond politics. Decisions made under urgency or emotional pressure can benefit from allowing time for reflection, considering competing views and separating immediate reactions from longer-term consequences.