xin4
means 'believe'
xin4
is made up of
where the first component is ren2 which means 'man' (a stick
figure of a walking person but when used as a Bushou as is the case here,
it is always tilted 45 degrees) and the second is yan which
means 'word' or 'speech' (a hieroglyph that depicts the tongue protruding
from the mouth - bottom square). A man who abides by his word is believable.
xin4xin1 means 'faith' and literally
translates as 'believe'-'heart'.
xin1
is a hieroglyph of the heart
.
xin4ren4 means 'trust' and literally
translates as 'believe'-'allow'.
ren4
has two components
where the first has been explained above and the second is ren
which has the connotation of 'come what may'. To accept another person's
decision is to 'allow' (sometimes with resignation).