Swami Sivananda describes five afflictions a Raja Yogi suffers: "Avidya (ignorance), Asmita (egoism), Raga (attraction), Dvesha (aversion) and Abhinivesha (clinging to mundane life). Samadhi destroys all this. Raga and Dvesha have five states - Udara (fully manifest), Vicchinna (hidden), Tanu (thinned out), Prasupta (dormant) and Dagdha (burnt). In worldly-minded people who are sunk in worldliness, Raga and Dvesha assume an Udara Avastha; they are in an expanded state i.e., they have a full and unhampered play. Vicchinna Avastha is that state in which Raga and Dvesha are hidden. The husband and wife sometimes quarrel; then love is temporarily hidden. Again she smiles; then love comes back. This is Vicchinna Avastha. Some people do a little bit of Pranayama, Kirtan and Japa. In them Raga and Dvesha become thinned out (Tanu Avastha). Sometimes, on account of unsuitable conditions, they lie dormant (Prasupta Avastha). In Samadhi they are burnt - Dagdha. Raga and Dvesha constitute this Samsara. They constitute the mind. Mind is a force which has no real entity but appears to be for the time being, and deludes the Jivas. It is superior to Prana. It is superior to matter. But, above the mind there is discrimination. Discrimination can control the mind; enquiry into your real nature or Atma-Vichara can control the mind. If you destroy the Raga-Dvesha through meditation and Samadhi, the mind will be annihilated. Your effort should be daily to practice concentration, even for five or ten minutes; then you will be able to control the mind and enter into Samadhi."
The perfection of concentration is best achieved through Jnana Yoga.