Be a free thinker and don't accept everything you hear as truth. Be critical and evaluate what you believe in.
AristotleAll men, or most men, wish what is noble but choose what is profitable; and while it is noble to render a service not with an eye to receiving one in return, it is profitable to receive one. One ought therefore, if one can, to return the equivalent of services received, and to do so willingly; for one ought not to make a man one's friend if one is unwilling to return his favors.
Aristotle