The word "chakra" is a sanskrit term meaning "wheel" or centre on the spine governing a group of functions. Some modern writers have equated these chakras with specific nerve ganglia in the body, however, the Yogis who first became aware of them saw them as psycho-spiritual centres responsible not only for physical activities but also open to higher or Divine level of consciousness.

The outward or physical level of their manifestation is responsible for such activities as exeretion and elimination, sexual activities, digestive processes, normal heart rhythm, breathing etc., speech and conscious thought.

In a past-unreal condition, the past perfect tense of the verb is used in the if clause and would have (should have, could have, might have ) is used in the main or answer clause.

Examples:

If I had known Helen's number, I would have called her.

If John had had the time yesterday, he would have gone with us.

There is great deal of mystery surrounding the sacred Mantra OM. Many have tried to unlock its secrets yet always there will remain more to be discovered. The earliest references we have to the Mantra OM are in that part of the vedic writings called the upanishads, the oldest of which were composed between 800-400 BC. The most concise explanation is found in the short Mandukya Upanishad which commences with the words.

The second type of conditional sentence is the present-unreal condition. In a present-unreal condition, the simple past tense of the verb is used in the if clause, and would (should, could, or might) is used in the main or answer clause. This is true for all verbs in English except the verb to be. In the case of the verb to be we use a special (subjunctive) form in all if clauses of this type. This special subjunctive form is as follows.

The Four Brahma Viharas or sublime moods are also subjects mentioned in the writings of the pali Canon and have come to occupy an important position in the field of Buddhism. They are not strictly meditations as they belong to the field of the higher emotions rather than the mind.

The following quotation from the mahasudassana sutta summarizes the nature and purpose of the exercise.

A conditional sentence is a sentence consisting of two clauses, a dependent clause beginning with if and a main clause or answer to the if clause. Example:

If John studies hard, he will pass his examinations.