doubt but that, doubt that

For concise writing, avoid using but after doubt.

• Wordy: I have no doubt but it will soon rain.
• Concise: I have no doubt it will soon rain.

Especially avoid doubt but that.

• Wordy: There is no doubt but that, in the eyes of history, religious tolerance is the highest evidence of culture in a people.
• Concise: There is no doubt that, in the eyes of history, religious tolerance is the highest evidence of culture in a people.