Humans are gifted with potentials. We are capacitated to utilize reason in order to comprehend situations and occurrences, and to unearth unrecognized existing things.
Parallel to this, man is always inquisitive; hence he tends to question and investigate. This itch that tickles his mind drives him to always want to know... to know what is there - whether they be real or unreal. Eventually, it leads him to the point where he would crave to know what is truly real, and yearn to possess knowledge of what is the truth.
When man comes to know the truth, then he is freed from his prison. He is now released from the bondage of ignorance, and let loose from the shackles of wanting to know the truth. Then, I'd say that the truth sets us free.
But inasmuch as the truth is also "information," truth is also a commodity... It may be hoarded; it may be made available for purchase. As it is said, "information is power."
Therefore, the truth can both make us rich and set us free. But in the end, freedom is the essence of being rich!