Childhood experience

Childhood experience plays a major role in shaping a person's character. It has its imprints on the whole life. I have read an article in which it has been disclosed that from womb to five years of age is very important.
What we hear in childhood, however trifle it may seem, it follows us all through the life. When I was a little girl, I heard that if you see a solitary sparrow it was unlucky. The saying goes like this, "One for sorrow, two for joy, three for letters, four for guests"
It seems meaningless, still when I go out and see a single bird I feel uneasy and search for another one. If I do not find another bird I become disappointed!