The mind rules non-devotees. Devotees rule the mind.
If we contemplate on bad, selfish and egoistic thoughts, the mind will force us to speak and act accordingly in due course of time.
Prabhupada was asked, “When the mind is drifting, what should we do?” Prabhupada said, “Chant loudly!”
Lecture on "Srila Prabhupada Gave Us Everything" – SB 3.5.51 – 31st May 1996
Mind is one's biggest enemy when uncontrolled, but majority people put full faith on their enemy.
The more we feed the laziness of our mind, the more it becomes strong.
There are two principles that constantly bewilder our minds – Attraction and Aversion! We have to constantly pray to Lord to help us deal with them.