What the Buddha Taught, p49[Among the three essentials – Ethical Conduct (Sila), Mental Discipline (Samādhi) and Wisdom (Paññā)] two factors, namely Right Thought and Right Understanding, go to constitute Wisdom.
Right Thought denotes the thoughts of selfless renunciation or detachment, thoughts of love and thoughts of non-violence, which are extended to all beings. It is very interesting and important to note here that thoughts of selfless detachment, love and non-violence are grouped on the side of wisdom. This clearly shows that true wisdom is endowed with these noble qualities, and that all thoughts of selfish desire, ill-will, hatred and violence are the result of a lack of wisdom—in all spheres of life whether individual, social, or political.
Right Understanding is the understanding of things as they are, and it is the Four Noble Truths that explain things as they really are. Right Understanding therefore is ultimately reduced to the understanding of the Four Noble Truths. This understanding is the highest wisdom which sees the Ultimate Reality.