Right Thought has three aspects:

renunciation

goodwill

harmlessness

These are opposite of:

desire

ill will

harmfulness

Which arrise from a mind that is filled with ignorance and that has not understood the nature and cause of suffering. The three aspects of Right Thought are beneficial and help to develop wisdom and Nirvana. The opposities lead to harm and suffering for oneself and others and entrap us in samsara.