Aquinas' Natural Law doctrine has four layers of law, which are:

Eternal Law: This is the highest level of law, which is the divine plan that governs the entire universe. According to Aquinas, the eternal law is God's wisdom and reason, and it is the foundation of all other laws. It is not directly accessible to human beings, but it is known through divine revelation.

 - Divine Law: This is the law that is revealed by God through the Scriptures and the teachings of the Church. It includes the Ten Commandments, as well as the teachings of Jesus Christ and the prophets. The divine law is accessible to human beings through faith and religious practice.

 - Natural Law: This is the law that is written in human nature and can be known through reason. According to Aquinas, human beings have a natural inclination towards the good and the avoidance of evil. The natural law is based on the principle of the preservation of life and the pursuit of the common good. It is accessible to all human beings, regardless of their religious beliefs.

 - Human Law: This is the law that is created by human beings to govern society. It is based on the natural law and is designed to promote the common good. Human law can take many forms, such as civil law, criminal law, and constitutional law.

The Five Primary Precepts are the basic principles of the natural law, and they are:

 - Preservation of Life: The primary precept that governs the natural law is the preservation of human life. This includes both the preservation of one's own life and the lives of others.

 - Reproduction: The second precept is the continuation of the species through procreation.

 - Education: The third precept is the need for education and the development of intellectual and moral virtues.

 - Socialization: The fourth precept is the need for socialization and the development of social virtues.

 - Worship of God: The fifth precept is the need to worship God and to live according to His will.

The virtues are the habits and dispositions that enable human beings to live according to the natural law. Aquinas identified four cardinal virtues, which are:

 - Prudence: The ability to make practical judgments about what is good and what is bad.

 - Justice: The virtue that governs the relationship between individuals and society, and between individuals themselves.

 - Temperance: The ability to control one's desires and passions.

 - Fortitude: The courage to do what is right, even in the face of danger or difficulty.

These virtues are essential for the development of a virtuous life, which is the goal of the natural law.
Aquinas also identified three theological virtues, which are:

 - Faith: The virtue by which one believes in God and accepts the truths revealed by Him.

 - Hope: The virtue by which one trusts in God and looks forward to eternal life.

 - Charity: The virtue by which one loves God above all things and loves one's neighbor as oneself.

These virtues are essential for the attainment of eternal life and the fulfillment of the natural law.

The relationship between the primary precepts, the virtues, and the layers of law in Aquinas' Natural Law doctrine can be understood as follows:

The primary precepts are the fundamental principles of the natural law, which are based on the preservation of life and the pursuit of the common good. The virtues are the habits and dispositions that enable human beings to live according to the natural law, by developing the practical wisdom, moral character, and spiritual orientation that are necessary for virtuous living.

The layers of law provide the context and framework for the natural law and the virtues. The eternal law, as the divine plan that governs the universe, establishes the ultimate purpose and meaning of human existence. The divine law, as the revealed law of God, provides the authoritative guidance and inspiration for virtuous living. The natural law, as the law written in human nature, provides the rational foundation and normative standard for ethical decision-making. And the human law, as the law created by human beings, provides the practical means for implementing the natural law in society.

In summary, Aquinas' Natural Law doctrine consists of a hierarchical system of laws, principles, and virtues that are designed to guide human beings towards the ultimate goal of eternal life and the common good. The primary precepts, the virtues, and the layers of law are interrelated and interdependent, and they provide a comprehensive framework for understanding the nature and purpose of human existence.
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