The word dharma in Sanskrit has ten different meanings. It was translated into Tibetan as chos, which means to change, to transform, or to make better. We have to alter our mind, transform it. When we talk of Dharma, it is not an alteration that tools can perform: only mind can transform mind. You have to use your mind to change your mind.
~ His Holiness the 17th Karmapa / The 29th Kagyu Monlam: Day Four