"NO"

The most important words in any language are small words. "Yes," for example. Love. God. These are words that are easy to utter, and they fill in empty spaces in our world.
However, there is one word – also a small one – that we find difficult to say: “No”.
And we see ourselves as generous, understanding, and polite. Because "no" is considered to be cursed, egoistic, not at all spiritual.
We have to be careful here. There are moments when we say "yes" to others and in fact are saying "no" to ourselves.
All the great men and women in the world have been people who, rather than say "yes", said a very big NO to everything that did not fit their ideal of bounty and growth.

Nagu ikka .. Paulo Coelho.