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There is a familiar saying, "It takes one to know one." It is usually delivered as an accusation, implying that the person who recognises a particular flaw in someone else must possess the same flaw themselves.

But perhaps there is more truth in the expression than we realise.

How do we recognise something in another person so quickly?

Perhaps because we have encountered it before.

Sometimes that experience comes from observing others. But sometimes it comes from knowing ourselves.

A person who has struggled with dishonesty may recognise evasiveness quickly. Someone who has experienced insecurity may notice it in another person. Someone who understands manipulation may detect it where others see only charm.

This raises an uncomfortable possibility.

Perhaps some of the shortcomings we identify most readily in others are the ones we have already learned to identify within ourselves.

That does not mean every criticism is projection. Sometimes we recognise genuinely harmful behaviour because we have developed the experience and awareness to see it. However, the intensity with which we react may reveal something about our own history. There is another paradox here.

The better we know ourselves, including our weaknesses, the more accurately we may recognise them in others. Self-awareness can therefore make us more perceptive, but it can also make us more judgmental if we forget that recognition is not the same as condemnation. Perhaps "it takes one to know one" is not necessarily an insult.

It can be an invitation to self-reflection.

Before asking, "How did I recognise that so quickly?" perhaps we should ask:

"What do I know about this behaviour because I have seen it in myself?"

Sometimes the qualities we recognise most clearly in others are the ones we have spent the most time confronting within ourselves.