Definition and Overview:
Spiritual beauty refers to the inner beauty that reflects the character and nature of God as manifested in a believer's life. It transcends physical appearance and is characterized by virtues such as love, humility, kindness, and holiness. This beauty is cultivated through a relationship with God and the work of the Holy Spirit in a believer's life.

Biblical Foundations:
The Bible emphasizes the importance of inner beauty over outward appearance. In 1 Samuel 16:7, the Lord tells Samuel, "Do not consider his appearance or his height, for I have rejected him. The LORD does not see as man does. For man sees the outward appearance, but the LORD sees the heart." This verse highlights that God values the condition of the heart above physical attributes.

Attributes of Spiritual Beauty:
1. Love: The greatest commandment is to love God and others (Matthew 22:37-39). Love is a defining characteristic of spiritual beauty, as seen in 1 Corinthians 13:4-7, which describes love as patient, kind, and not self-seeking.

2. Humility: Spiritual beauty is marked by humility, as believers are called to emulate Christ's humility. Philippians 2:3-4 instructs, "Do nothing out of selfish ambition or empty pride, but in humility consider others more important than yourselves."

3. Holiness: A life set apart for God reflects spiritual beauty. 1 Peter 1:15-16 urges believers, "But just as He who called you is holy, so be holy in all you do, for it is written: 'Be holy, because I am holy.'"

4. Gentleness and Kindness: These virtues are fruits of the Spirit (Galatians 5:22-23) and are essential components of spiritual beauty. Ephesians 4:2 encourages believers to "be completely humble and gentle; be patient, bearing with one another in love."

Cultivation of Spiritual Beauty:
Spiritual beauty is cultivated through a life of devotion, prayer, and obedience to God's Word. Romans 12:2 advises, "Do not be conformed to this world, but be transformed by the renewing of your mind." This transformation is achieved by aligning one's thoughts and actions with God's will.

Role of the Holy Spirit:
The Holy Spirit plays a crucial role in developing spiritual beauty. As believers yield to the Spirit, they are transformed into the image of Christ. 2 Corinthians 3:18 states, "And we all, who with unveiled faces contemplate the Lord’s glory, are being transformed into His image with ever-increasing glory, which comes from the Lord, who is the Spirit."

Examples in Scripture:
1. Esther: While Esther's physical beauty is noted, her spiritual beauty is evident in her courage, wisdom, and faith in God, which ultimately led to the deliverance of her people (Esther 4:14-16).

2. Mary, the Mother of Jesus: Mary's spiritual beauty is seen in her humility and obedience to God's will, as she responds to the angel Gabriel, "I am the Lord’s servant. May it happen to me according to your word" (Luke 1:38).

3. Ruth: Ruth's loyalty, kindness, and faithfulness to Naomi and to God exemplify spiritual beauty. Her character is praised by Boaz, who says, "All my fellow townsmen know that you are a woman of noble character" (Ruth 3:11).

Conclusion:
Spiritual beauty is a reflection of God's character in a believer's life, cultivated through a relationship with Him and the transformative work of the Holy Spirit. It is marked by love, humility, holiness, and other virtues that align with God's nature.