Only the wearer knows where the shoe pinches

No one except he who is experiencing it knows the cause of a trouble or difficulty. His behaviour is not understood by other because they are unaware of the motive behind it. For example, a man resigned from a highly paid post in a business organisation for no apparent reason, and everyone wondered why. The truth was that the managing director’s wife had fallen in love with him, which had caused him so much embarrassment that the only way to avoid her was to seek employment elsewhere.