To be a Buddhist, one is expected primarily to take refuge in the Triple Gem: the Buddha, Dhamma and Sangha. Buddha means the Enlightened One. Dhamma means Truth realized and taught by the Buddha. Sangha means the Buddha’s disciples who behave and practice righteously. The ideal Sangha means those who attain the four states of Noblehood. The meaning of the Triple Gem or the Buddha, Dhamma and Sangha may be understood in three different levels as follows:
1. The First Level - The Buddha: the Enlightened One represented by his replica or Buddha image. Dhamma: Truth realized and taught by the Buddha, represented by Tripitaka or the Buddhist scripture. Sangha : the Buddha’s noble disciples represented by Buddhist bhikkhus (monks) and bhikkhunis (nuns) in general, who have not yet attained the Four States of Noblehood. The Sangha in this level is called Conventional Sangha or Sammati Sangha
2. The Second Level - The Buddha: the Enlightened One, who was formerly Prince Siddhattha of the Sakya clan. He renounced the worldly life in search of Truth and after His Enlightenment established Buddhism. Dhamma : Truth realized and taught by the Buddha, learned and put into practice by the Buddhists, both ordained and lay people. Sangha: the Buddha’s noble disciples who have attained the Four States of Noblehood.
3. The Third Level - The Buddha, Dhamma and Sangha become one. The Buddha in this level is identical with Dhamma as it was stated by Him that “One who sees Dhamma sees me; one who sees me sees Dhamma.” This shows that Buddhahood is Dhamma and Dhamma is Buddhahood. The ideal Sangha is the embodiment of the realized.
When we take refuge in the Sangha it means we take refuge in the virtues that is good, virtuous, kind, compassionate and generous. We don't take refuge in things that are mean, nasty, cruel, selfish, jealous, hateful, angry, even though admittedly that is what we often tend to do out of heedlessness, out of not reflecting, not being awake, but just reacting to conditions so that is why it is not common to hear of people wanting to take ordination as it takes a lot of determination, discipline and right motivation to achieve this.