SB 9.1.20
etat sankalpa-vaisamyam
hotus te vyabhicaratah
tathapi sadhayisye te
suprajastvam sva-tejasa
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
This discrepancy in the objective is due to your priest’s deviation from the original purpose. However, by my own prowess I shall give you a good son.