Sutra:
207. "cacAla sAbanj ca mumOca veera:" engiRapadiyE ivai anupAyangaLAna mAthramanRikkE kAlkattengiRadhu.

Sri PBA Swami's Sarartha Deepikai:
Why should one follow this means, only after giving up the other means?

Even if there is a small association with these other means, not only will it not take one to liberation, it will also be a hindrance to that goal. There is an example for this.

Ravana who was attacked by Sri Rama's fierce arrows was unable to raise even one arrow and stood in despair. But the arrows from Sri Rama did not stop and kept continuing to fall on him. Ravana began to wonder why Sri Rama, who knew the dharma of war, has not stopped his attack when Ravana was unable to fight back. Them he realized that it was because he still had his bow in his hand. So he dropped that too. At that point, Sri Rama stopped his attack and asked him to go back and return the next day.

The bow which was in the hand of Ravana was a tool for him to defeat his enemies; beyond that, it was also the reason for suffering at the hand of the Lord. The divine words "gaccAnujAnAmi" did not come out till he dropped that bpw. Therefore, it is clear that it acted as an obstacle.

The other means are also the same - if there is even the smallest attachment to them, they will hinder the flow of the divine grace.