In the first chapter of Titus, Paul instructs Titus to expose those that use lies and deceit to get financial gain from those that are not strong in their knowledge of the Bible or their faith in God.
Those that go about stating that you will only be happy when you turn to the person inside yourself, here is the thing. God does communicate to most through their soul and mind, which is what is inside us. What is important to realize though is that God is NOT inside us. We are a creation of God only. What is in us is our mind and soul. We are an echo of the holy trinity, given as prove that God is real. We are a mind, which is corrupt and able to commit sin with just a thought. We are a body, the vehicle to outwardly commit sin. We are a soul, which is the gift of God, and that part of us that will live on once the corrupt stops working or is replaced with the promised perfect and immortal body.
We are not to seek happiness for ourselves but happiness for others and when we do that is when God rewards us if He so desired to do so. It is clearly stated in the Bible that our reward is not on this planet, but in the eternal life that is to come.
If anyone promises you earthly rewards then they serve the one that is in charge of earth at this time, and that is not God by the way.

1 John 5, 19 And we know that we are of God, and the whole world lieth in wickedness.
Matthew 12, 24: But when the Pharisees heard it, they said, This fellow doth not cast out devils, but by Beelzebub the prince of the devils. 25: And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand:
Matthew 16, 27: For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works.
Matthew 25, 21: His lord said unto him, Well done, thou good and faithful servant: thou hast been faithful over a few things, I will make thee ruler over many things: enter thou into the joy of thy lord.