"not lagging in diligence, fervent in spirit, serving the Lord, rejoicing in hope, patient in tribulation, continuing steadfastly in prayer, distributing to the needs of the saints, given to hospitality. " Romans 12:11-13
I watched this video while ago, and it really impacted my way of thinking how human being can know God.
Conscience is a wonderful gift that God has given to us.
If you study Romans 1:20, 2:15, you'll find more about it