Gretchen Rubin Quotes
Try to never say 'yes' on the phone; instead, say, 'I'll get back to you.' When you're actually speaking to someone, the desire to be accommodating is very strong, and can lead you to say 'yes' without enough consideration.
Citations
Rubin, Gretchen. "Secret of Adulthood: Don't Say 'Yes' on the Phone." Gretchen Rubin, 5 May 2011.
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Gretchen Craft Rubin is an American author, blogger and speaker.