yin1
means 'cause'
yin1
has the following two components
.
The first component denotes an enclosed space and the second component
is the character da meaning 'big man'. When a big man is
shut up in a small cubicle, he will never remain passive because he is
a grown-up person and not a passive baby. Something is bound to happen
thus the concept of 'cause'.
yuan2yin1 means 'reason' and literally
translates as 'origin'-'cause'.
yuan2
is composed of
where the first component is a graphical representation of a 'precipice'
and the second component denotes 'water spring'. Water flows from the top
and therefore the concept of 'origin'.
yin1guo3 means 'cause and effect'
and literally translates as 'cause'-'fruit'.
guo3
is from the script
which shows something on top of a tree and hence denotes 'fruit'. Other
extensions of guo3 are 'result' and 'consequence'.