Mind of Christ

Why is it an unbeliever friend of mine able to exercise such enviable ethics like dedicated hard work, genuine leadership qualities, strong discipline and generosity to mankind whom he regards his worthy neighbor?
As I reread it only the Holy Spirit empowers believers to understand the mind of Christ and to know the burdens in his heart.

These qualities you mention, are valuable assets recognized as social ‘laws’ by all successful people, whether they believe in Jesus or not.
You mentioned ‘generosity to mankind whom he regards his worthy neighbor.’
Does his ‘worthy neighbor’s agree with Christ’s ’ worthy neighbor’?
How does one qualify as a 'worthy neighbor’s in his eyes?
Read the story of the good Samaritan in Luke 10:30-37.
In Christ, anyone in need is your neighbor.