http://www.thefreedictionary.com/in+earnest
Excerpt:
ear·nest ¹  (ûrnst)

adj.

1. Marked by or showing deep sincerity or seriousness: an earnest gesture of goodwill.

2. Of an important or weighty nature; grave. See Synonyms at serious.

Idiom:

in earnest

1. With a purposeful or sincere intent: settled down to study in earnest for the examination.

2. Serious; determined: "Both sides are deeply in earnest, with passions that approximate those of civil war" (Conor Cruise O'Brien).

[Middle English ernest, from Old English eornoste; see er-¹ in Indo-European roots.]

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earnest·ly adv.

earnest·ness n.

Soulmates and reincarnation 3 http://www.youtube.com/watch?v=1FaBg4mQUSY&feature=related

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http://www.thefreedictionary.com/in+earnest