The first thing which should be taught to every human being as soon as he is able to think, is that he should obey reason which is a super instinct of the species 
The Mother 
 
It is the basic wisdom of human life, purely human life; every human being who obeys anything other than reason is a kind of brute lower than the animal 
The Mother 
 
Reason is the mother of the nature of mankind. One must obey reason and absolutely refuse to be the slaver of instincts 
The Mother 
 
Reason ! everyone possesses reason only, he doesn't make use 
The Mother 
 
Reason is  developed like the muscles, like the will. All these things are developed by a rational use 
The Mother 
 
Let reason mould, control and regulate your thinking 
Zarathushtra 
 
Let my faith be wedded to Reason, and let it be based on conviction 
Zarathushtra 
 
Think for yourself and never through others 
Zarathushtra 
 
God has not created anything better than reason, or anything more perfect or more beautiful than reason; the benefits which Gods gives are on its account; and understanding is by it, and God's wrath is caused by it, and by it are rewards and punishments 
Prophet Muhammad 
 
The full ripeness of reason is intuition, but intuition cannot antagonise reason 
Swami Vivekananda