Mind:
mind one's P's and O's    　小心翼翼
be absent-minded　　　　心不在焉
keep one's mind on　　　专心致志
be broad minded　　　　心胸宽阔
have sth on one's mind　心事重重
one can't keep one's mind on two things at the same time 一心不可而用
both the mind and strength are worm out　　心力交瘁
the mind wanders / have not upright 　心术不正
out of sight, out of mind　　眼不见心不烦
be narrow-minded　　　心胸狭窄
be kind-hearted　　　　心地善良

heart:
heart of stone　　　铁石心肠
set one's heart at rest　心平气和
heart stands still 　　提心吊胆
from one's heart　　真心实意
one's heart still fluttering with fear　心有余悸
be    downhearted　　心灰意冷
be black-hearted and cruel 　心黑手辣
be heart-stricken　　心如刀割
be softhearted　　　心慈手软

Others:
one's mind is in a tumult 　心潮澎湃
feel quite at ease　　心安理得
willingly and gladly　　心慈手软
be wild with joy　　　心花怒放
fit and happy 　　　　心宽体胖
fremble with fear　　心惊胆战
relaxed and happy　　心旷神怡
very much upset and all confused　心乱如麻
be fully satisfied　　　心满意足
share the same feeling　　　　心心相印
be in an impulsive moment　　心血来潮
in a restless and jumpy mood　心猿意马
submit willingly 　　　　　　　心悦臣服
have a tacit understanding　　心照不宣