If you first fortify yourself with the true knowledge of the Universal Self, and then live in the midst of wealth and worldliness, surely they will in no way affect you.
One cannot completely get rid of the six passions: lust, anger, greed, and the like. Therefore one should direct them to God. If you must have desire and greed, then you should desire love of God and be greedy to attain Him.
Through selfless work, love of God grows in the heart. Then through his grace one realize him in course of time. God can be seen. One can talk to him as I am talking to you.
Imagine a limitless expanse of water: above and below, before and behind, right and left, everywhere there is water. In that water is placed a jar filled with water. There is water inside the jar and water outside, but the jar is still there. The 'I' is the jar.
Brahman is beyond mind and speech, beyond concentration and meditation, beyond the knower, the known and knowledge, beyond even the conception of the real and unreal. In short, It is beyond all relativity.
Wisdom leads to unity, but ignorance to separation.
So long as God seems to be outside and far away, there is ignorance.
But when God is realised within, that is true knowledge.
Those whose spiritual awareness has been awakened never make a false move. They don't have to avoid evil. They are so replete with love that whatever they do is a good action. They are fully conscious that they are not the doer of their actions, but only servants of God.