śabda-brahmaṇi niṣṇāto na niṣṇāyāt pare yadi śramas tasya śrama-phalo hy adhenum iva rakṣataḥ

sabda-brahmani nisnato
na nisnayat pare yadi
sramas tasya srama-phalo
hy adhenum iva raksatah
"If one is learned in Vedic literature but is not a devotee of Lord Visnu, his work is a useless waste of labor, just like the keeping of a cow that does not give milk." (Bhag. 11.11.18)
Anyone who does not follow the surrendering process but is simply interested in an academic career cannot make any advancement. His profit is only his labor for nothing. If one is expert in the study of the Vedas but does not surrender to a spiritual master or Visnu, all his cultivation of knowledge is but a waste of time and labor.