The enemies of hatred and craving,
Do not have legs, arms, and so forth;
They are neither heroic or wise
And yet they have enslaved me.
~Shantideva
Reflecting upon the manifold shortcomings of our delusions is essential in order to develop the inspiration to try to overcome them. As it is true that if we do not think about suffering, we will not wish for liberation, in the same way, if we are not familiar with the shortcomings of our own delusions, we will not make any effort to conquer them. As the negative thought manifests, we must think, "Here comes this thought to destroy my peace and happiness." Even if we can't remember the benefits of liberation and enlightenment, at the very least we must try to recall the immediate harm that this mind can bring us - when a delusion arises, it destroys the peace and happiness of all of our daily activities. This alone should lead us to wish to avoid its manifestation.
Just as we say, "Before the water rises, we build the floodgates," before the delusions arise we must construct our own internal barriers. Since we do not have the defense of having realized emptiness or pure compassion, we have a very small island of protection, but it is protection nonetheless. Even if we can do nothing else, at the very least we can resolve not to allow our minds to indulge in inappropriate attention on an object. It takes very little time for our mind to turn something into a really big deal. Once the water starts to overflow, it is much too late to stop it.
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To overcome anger, you can consider Shantideva's advice from the Guide to the Bodhisattva's Way of Life, there is no evil like anger, as a single moment of anger can destroy the merits that you have accumulated over thousands of eons. In the stupor of the mind of anger, we totally disregard people who have been most kind to us. The physical or verbal activities that we engage in having been motivated by anger are extremely destructive. Also, although we may sometimes ornament ourselves to become beautiful, once our minds are consumed with anger, it doesnt matter how much we decorate ourselves, we cannot hide the ugliness of anger.
If you think about these points for a little while, you will begin to get a feeling for how destructive anger is. But please keep in mind that the antidote to anger - which is the practice of patience - brings as much benefit as anger does harm. It is said in the texts that the mind of patience creates the basis of happiness in this and future lifetimes.
To overcome attachment, you should begin by considering how there are countless lifetimes' worth of the imprints of attachment in your minds, and that it is an attachment and the delusions related to it - such as craving and grasping - that create the causes to pereptuate your existence in samsara. Attachment is like the tether that binds you to cylical existence.