Because it is:-

1. The measure of man’s guilt, Acts 3:13-15.
2. The manifestation of God’s love, Rom 5:6-8.
3. The means of salvation, Jn 3:14-15.
4. The mark of separation, Gal 6:14.
5. The motive of service, 2 Cor 5:14f.
6. The melody of heaven, Rev 5:8-10.

(Source unknown)