The following is from 'The Pocket Thich Nhat Hanh' (click)
and published by 'Shambhala Pocket Classics'.
"The purpose of meditation is to look at something deeply and see its roots.
Whatever kind of action we take, if we look deeply into it,
we'll be able to recognize the seed of that action.
That seed may come from our ancestors.
Whatever action we take, our ancestors are taking it at the same time with us.
So father, grandfather, and great-grandfather are doing it with you;
mother, grandmother, and great-grandmother are doing it with you.
Our ancestors are in every cell of our body.
There are seeds that are planted during your lifetime,
but there are also seeds that were planted before you manifested as this body."