seeing is believing

seeing is believing idiom
Only physical or concrete evidence is convincing, as in She wrote us that she's lost twenty pounds, but seeing is believing. This idiom was first recorded in this form in 1639.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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