Man must be an investigator for himself

"We must not be content with simply following a certain course because we find our fathers pursued that course. It is the duty of everyone to investigate reality, and investigation of reality by another will not do for us. If all in the world were rich and one man poor, of what use are these riches to that man?
If all the world be virtuous and a man steeped in vice, what good results are forthcoming from him? If all the world be resplendent and a man blind, where are his benefits? If all the world be in plenty and a man hungry, what sustenance does he derive?
Therefore, every man must be an investigator for himself. Ideas and beliefs left by his fathers and ancestors as a heritage will not suffice, for adherence to these are but imitations, and imitations have ever been a cause of disappointment and misguidance. Be investigators of reality that you may attain the verity of truth and life."

`Abdu'l-Bahá: The Promulgation of Universal Peace P.295