14:10 The heart knows its own bitterness,
and with its joy no one else can share.
20:5 Counsel in a person’s heart is like deep water,
but an understanding person draws it out.
20:27 The human spirit is like the lamp of the Lord,
searching all his innermost parts.
17:9 The human mind is more deceitful than anything else.
It is incurably bad. Who can understand it?