Third man in the Party

Ever heard of this statement  ”Third man in the party”.

    If are a maths man you might have heard in the different in the way ..like 

you need third variable in the swapping of two numbers.The variable which we don’t need, but we use that for desired result..is the third man.

    For a homely person ..he thinks of  a party ..actually he invited some people to his party …but he had to invite some one whom he doesn’t

so as not to loose his reputation..even though the third man‘s effect not much in the party ..but there is some linch in the first man(host).

    What actually is the third is Our mind because of this we are getting the third variable…we do have to control our mind.