Sutra:
162. upAyAntharangaLai vittu caramOpAyaththaip paRRinAp pOlE upEyAntharamAna aisvarya kaivalyangaLai vittu ellaiyAna prApyaththai arththikkiRadhu.

Meaning:
In the first part of the mantra, the siddhOpAya (His being the means and the end), which is above all other means such as Karma, Gnyana and Bhakti, was seeked. Similarly in this part of the mantra, the other goals such as wealth and knowledge of the self are rejected and the final goal (service), that is above all these, is seeked.

Sri PBA Swami's Sarartha Deepikai:
Why should other goals be rejected and this (service) be seeked?

Seeking the last of the means (siddhopayam) while giving up other means such as Karma, Gnyana and Bhakti is appropriate to the chetana whose nature is that of not having any other means.

Similarly, in praying for the goal, seeking the last goal (service to Him) while rejecting other ends such as wealth and knowledge of the self is appropriate to the chetana whose nature is that of not having any other enjoyment.