When Buddhist and Hindu texts talk about non-duality, it is often misunderstood as never making judgments. Non-duality points to a state of consciousness that is at peace. However, we live in the world and that requires discernment of right and wrong. This is why Buddhism and Hinduism have ethical rules.
Judgments of right and wrong can be made quickly. Then one can return to non-dual awareness. It is the petty judgments of the discursive mind that are surrendered to allow inner-peace to emerge. These are judgments about what you like and dislike. They lead to the emotions of annoyance, resentment, anger, jealousy, craving, etc.
Meditation which is used to cultivate non-dual awareness, is only one practice. There are many more for the cultivation of the qualities of compassion, kindness, generosity, patience, etc. To manifest these qualities in the world, one cannot be passive. One acts to make the world a better place.
To be truly wise, one needs more than inner-peace. One needs compassion, kindness, generosity, patience, etc.; one needs to take action and one needs to make the distinction between right and wrong.