Definition and Concept
Usefulness to God refers to the capacity and willingness of individuals to serve God's purposes and fulfill His will. It encompasses the idea that believers are called to be instruments in God's hands, contributing to His divine plan through their actions, words, and lives. This concept is rooted in the understanding that God, while sovereign and all-powerful, chooses to work through human agents to accomplish His purposes on earth.

Biblical Foundations
The Bible provides numerous examples and teachings that illustrate the concept of being useful to God. In 2 Timothy 2:21 , the Apostle Paul writes, "If anyone cleanses himself from what is dishonorable, he will be a vessel for honorable use, set apart as holy, useful to the Master, prepared for every good work." This verse highlights the importance of personal holiness and readiness in being useful to God.

In the Old Testament, figures such as Moses, David, and Esther demonstrate how God uses individuals to achieve His purposes. Moses, despite his initial reluctance, became a leader who delivered the Israelites from Egypt (Exodus 3-4). David, a shepherd boy, was chosen to be king and a man after God's own heart (1 Samuel 13:14). Esther, through her courage and faith, saved her people from destruction (Esther 4:14).

Spiritual Gifts and Talents
The New Testament emphasizes the role of spiritual gifts in being useful to God. In 1 Corinthians 12:4-7 , Paul explains, "There are different gifts, but the same Spirit. There are different ministries, but the same Lord. There are different ways of working, but the same God works all things in all people. Now to each one the manifestation of the Spirit is given for the common good." Believers are endowed with various gifts and talents, which are to be used for the edification of the church and the advancement of God's kingdom.

Faithfulness and Obedience
Faithfulness and obedience are key attributes of those who are useful to God. In Matthew 25:21 , Jesus commends the faithful servant, saying, "Well done, good and faithful servant! You have been faithful over a few things; I will make you ruler over many things. Enter into the joy of your master." This parable underscores the importance of being faithful in small tasks as a prerequisite for greater responsibilities in God's service.

Humility and Dependence on God
Humility is another essential quality for usefulness to God. James 4:10 instructs, "Humble yourselves before the Lord, and He will exalt you." Recognizing one's dependence on God and submitting to His will are crucial for being effective in His service. The Apostle Paul, despite his significant contributions to the early church, acknowledged his weaknesses and relied on God's strength (2 Corinthians 12:9-10).

Transformation and Renewal
The process of becoming useful to God involves transformation and renewal. Romans 12:1-2 urges believers, "Therefore I urge you, brothers, on account of God’s mercy, to offer your bodies as living sacrifices, holy and pleasing to God, which is your spiritual service of worship. Do not be conformed to this world, but be transformed by the renewing of your mind." This transformation enables believers to discern and carry out God's will effectively.

Conclusion
While the Bible does not explicitly use the term "usefulness to God," the concept is woven throughout Scripture, emphasizing the importance of being prepared, faithful, and willing to serve God's purposes. Through personal holiness, the exercise of spiritual gifts, and a life of obedience and humility, believers can become valuable instruments in the hands of the Almighty.