Rational being. How do you define it? What sort of behavior or thinking can be treated as rational? Spiritual rationalism based on presence of GOD while atheist rationalism based on absence of GOD.
In my opinion rational beings are those who bring happiness to others, those who know the truth. Rationalism based on falsehood cannot really be rational.
After God realization, you are full with infinite happiness and then only you can really be rational in your behavior, as you would try to make others happy by sharing your happiness with them. Till then you yourself are trying to seek your own happiness. Your every action is directed to it.
About hiding or secrecy you”re aware that in many cases secrecy is kept to benefit others. Sometimes divulging sensitive information may be disastrous. Secrecy, therefore, cannot be termed as irrational. However, there is a difference in the politicians who keep things secret for their selfish ends and in the saints who keep things secret for the benefit of the followers.