You do not renounce venom because somebody told you to do so. But, normally it is not possible to reject anything unless one understands its nature. Things we cannot understand are a source of fear. When we do not know what a thing is made up of, we are very insecure about it. When we have understood threadbare the structure of a thing, we, automatically, feel a detachment for it.
Knowledge removes desire.
The detachment comes because we cannot desire the thing any more. We cannot desire it any more because we know that it cannot fulfil our longing. We have a wrong notion of things and then cling to them. When the notion gets clarified about things, there is a spontaneous rising from the level of attachment to them. We rise up rather than cut ourselves from that particular circumstance.