The Four Sinners, The Four Saints

In the Bhagavad-gita Krishna explains the four types of persons who reject Him, as well as the four types of persons who approach Him.1

The types that reject Him are:
1. The man who works like an ass and tries to enjoy like one, forgetting God completely
2. Someone who is not even civilized to think of God
3. Someone who is caught up in the pursuit of mundane knowledge
4. The out and out atheist who is determined never to worship God and attempts to convert others to his view point

God is approached by those:

1. Desiring relief from distress
2. Desiring knowledge
3. Desiring wealth or other material benefits
4. Who are inquisitive or curious

Of course these are mixed motives, but ultimately one will be purified of these if one sticks to the spiritual path.

“Pure love of God" means that one simply wants to please God, and one is ready to sacrifice his own happiness to accomplish this end. When one feels this way, he experiences the greatest happiness. Pure love of God is the greatest gift that God can give.
1.Bhagavad-gita 7.16, 7.19