The first duty of a man is to love God with all his heart, all his soul, and all his mind. And his neighbor as himself.

(Luke 10:25-27 NIV) On one occasion an expert in the law stood up to test Jesus. "Teacher," he asked, "what must I do to inherit eternal life?" {26} "What is written in the Law?" he replied. "How do you read it?" {27} He answered: "'Love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind' ; and, 'Love your neighbor as yourself.'"