Victory Over Intrusive Thoughts.
In the beginning of your practice of thought-control you will experience great difficulty.
You will have to wage war with them. They will struggle their level best for their own existence.
They will say, “We have every right to remain in this palace of mind. We have a sole monopoly from time immemorial to occupy this area. Why should we vacate our dominion now? We will fight for our birthright till the end.”
They will pounce upon you with great ferocity. When you sit for meditation only, all sorts of evil thoughts will crop up. As you attempt to suppress them they want to attack you with redoubled force and vigour. But positive always overcomes the negative.
Just as darkness cannot stand before the sun, just as the leopard cannot stand before the lion so also all these dark negative thoughts—these invisible intruders, enemies of peace—cannot stand before the sublime divine thoughts. They must die by themselves.
~ Sri Swami Sivananda, Thought Power