The Visible Teaching
Aṅguttara Nikāya 31 (III, 53-54)
The Buddha is asked “In what way is the Dharma directly visible, immediate, inviting one to some and see, worthy of application, to be personally experienced by the wise?”
He answers that when a person is impassioned with lust, depraved through hatred or bewildered by delusion they plan for their own harm, the harm of others or the harm of both, they experience suffering, grief, they behave badly in body, speech and mind. If they act out of non-lust, non-hatred and non-delusion then their behaviour can be seen to be the reverse of the above.