Happiness is your nature. It is not wrong to desire it. What is wrong is seeking it outside when it is inside.
--Jiddu Krishnamurti

Q: What is happiness? Happiness is the very nature of the Self; happiness and the Self are not different. There is no happiness in any object of the world. We imagine through our ignorance that we derive happiness from objects. When the mind goes out, it experiences misery.
In truth, when its desires are fulfilled, it returns to its own place and enjoys the happiness that is the Self. Under the tree the shade is pleasant; out in the open the heat is scorching. A person who has been going about in the sun feels cool when he reaches the shade. Someone who keeps on going from the shade into the sun and then back into the shade is a fool. A wise man stays permanently in the shade. Similarly, the mind of the one who knows the truth does not leave Brahman(self). The mind of the ignorant, on the contrary, revolves in the world, feeling miserable, and for a little time returns to Brahman(self) to experience happiness. In fact, what is called the world is only thought. When the world disappears, i.e. when there is no thought, the mind experiences happiness; and when the world appears, it goes through misery.
-Sri Ramana Maharshi

Q: Of the devotees, who is the greatest?
He who gives himself up to the Self that is God is the most excellent devotee. Giving one’s self up to God means remaining constantly in the Self without giving room for the rise of any thoughts other than that of the Self. Whatever burdens are thrown on God(self), He bears them. Since the supreme power of God makes all things move, why should we, without submitting ourselves to it,constantly worry ourselves with thoughts as to what should be done and how, and what should not be done and how not? We know that the train carries all loads, so after getting on it why should we carry our small luggage on our head to our discomfort, instead of putting it down in the train and feeling at ease?
-Sri Ramana Maharshi

Q: How does maturity come about?
M: By keeping your mind clear and clean, by living your life in full awareness of every moment as it happens, by examining and dissolving one's desires and fears as soon as they arise

-Nisargadatta Maharaj

Without the grace of the Self, there is no success. Because of faith in yourself you get it. You may worship God, but don’t consider God as separate. The knowledge ‘I am’ is within you with that conviction you worship. One who meditates on the knowledge, ‘I am’, everything in the realm of consciousness becomes clear to him. He lives without telling it, hence from this place, you carry the conviction about yourself that you know the knowledge ‘I am’ is God, there can be no other gain. There are those who without knowing themselves, start preaching.

-Nisargadatta Maharaj

Whatever I do not know directly, I do not believe. My knowledge is not knowledge of Brahman or Ishwara, Brahman and Maya are natives of my
nature only.

-Sri Nisargadatta Maharaj