Vedas in the beginning deals with the karma Kanda section that leads one gradually to the process of Self Realization. So Srila Prabhupada is explaining here that one must not remain just on the fruitive results parts but go beyond it as the ultimate goal of the vedas is to understand Kṛṣṇa. It is already mentioned in the 15th Chapter, vedaiś ca sarvair aham eva vedyaḥ. It is also confirmed in Srimad-Bhagavatam that one who is chanting the holy names of the Lord is said to have bathed in all holy rivers, read all Vedic scriptures and so on. Even a dog eater who chants the holy names of the Lord is liberated and transported to the highest stage of devotional service.Like when Lord Chaitanya was chanting the Hare Kṛṣṇa Mahā-mantra, people used to come and say to him that why is he just chanting Hare Krishna and not studying the Vedic literatures? So He replied that His spiritual master considered Him as the greatest fool and thus asked Him to chant only Hare Krishna. And He did so, as a result He became a madman, staunch lover of the holy name. So in this age of Kali, we all are also fools and cannot understand the vedas, therefore chanting of Hare Krishna is required.
