Why must one carry a thorn in his flesh forever

Friendship has many dimensions.

The most important factors seem to be the qualities of the friend, the compatibility and the relevance of the connection.

In a friendship, like in any other relationship, the degree of concern of one friend to the other friend need not be equal to what the other friend shows him. That is a fact and is easily understandable

However, if only one of the two is friendly and the other is just not interested, nothing worthwhile can come out of such friendship

It is just like tying a heavy stone around ones ankle while walking.

That will just add dead weight and invite unnecessry pain.

The sad part of any friendship is that people become effusive apparently and even trust that the other person is also friendly, genuinely caring and not overly selfish.

However, very often the hollowness and purposelessness and even the potent risks and dangers would come to our knowledge much later.

Then it is better to cut off, perform a surgical removal, when we discover the imposition.

Why must one carry a thorn in his flesh forever, just because it was present there unnoticed or undetected for some time?