SB 7.8.9
jahy asuram bhavam imam tvam atmanah
samam mano dhatsva na santi vidvisah
rte ’jitad atmana utpathe sthitat
tad dhi hy anantasya mahat samarhanam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Prahlada Maharaja continued: My dear father, please give up your demoniac mentality. Do not discriminate in your heart between enemies and friends; make your mind equipoised toward everyone. Except for the uncontrolled and misguided mind, there is no enemy within this world. When one sees everyone on the platform of equality, one then comes to the position of worshiping the Lord perfectly.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Unless one is able to fix the mind at the lotus feet of the Lord, the mind is impossible to control. As Arjuna says in Bhagavad-gita (6.34):
cañcalam hi manah krsna
pramathi balavad drdham
tasyaham nigraham manye
vayor iva suduskaram
“For the mind is restless, turbulent, obstinate and very strong, O Krsna, and to subdue it, it seems to me, is more difficult than controlling the wind.” The only bona fide process for controlling the mind is to fix the mind by service to the Lord. We create enemies and friends according to the dictation of the mind, but actually there are no enemies and friends. Panditah sama-darsinah. Samah sarvesu bhutesu mad-bhaktim labhate param. To understand this is the preliminary condition for entering into the kingdom of devotional service.