Kataha Upanishad is a widely known Upanishad and translated into Persian, through which it made it;s way to Europe. Since then it has been translated into English, German and French. Katha Upanishad is loosely translated as "Secret of Death". This presents a dialogues between Nachiketa and Lord of Death - Yama. The first lesson we get from this Upanishad is overpwering our desires and greed. Nachiketa asked Yama about "What happens to Soul after death?". But Yama offerred him wealth, long life, master of universe, and anything a man could desire for. But Nachiketa replied - these are all only itching of senses and not ever-lasting. Thus in life we have 2 choices - one is good and one is pleasent. What we will choose? Something that is good or something that is good for our senses only? This same message is in Shree Bhagwad Gita - about overpowering our senses with our mind by meditation. Part Two, Chapter II: #11 As the sun, which helps all eyes to see, is not affected by the blemishes of the eyes or of the external things revealed by it, so also the one Atman, dwelling in all beings, is never contaminated by the misery of the world, being outside it. #12 There is one Supreme Ruler, the inmost Self of all beings, who makes His one form manifold. Eternal happiness belongs to the wise, who perceive Him within themselves-not to others. #13 There is One who is the eternal Reality among non-eternal objects, the one truly conscious Entity among conscious objects and who, though non-dual, fulfils the desires of many. Eternal peace belongs to the wise, who perceive Him within themselves-not toothers. #14 The sages realise that indescribable Supreme Joy as This is That. How can I realise It? Is It self-luminous? Does It shine brightly, or not? #15 The sun does not shine there, nor the moon and the stars, nor these lightnings-not to speak of this fire. He shining, everything shines after Him. By His light all this is lighted. Part Two, Chapter III #4 If a man is able to realise Brahman here, before the falling asunder of his body, then he is liberated; if not, he is embodied again in the created worlds. #5 As in a mirror, so in the buddhi; as in a dream, so in the World of the Fathers; as in water, so Brahman is seen in the World of the Gandharvas; as in light and shade, so in the World of Brahma.