Self-Knowledge

It is a good day to me when thou givest me
  a glimpse of myself;
Sin is my greatest evil,
  but thou art my greatest good;
I have cause to loath myself,
  and not to seek self-honour,
  for no one desires to commend his own dunghill.
My country, family, church
  fare worse because of my sins,
  for sinners bring judgment in thinking
    sins are small,
  or that God is not angry with them.
Let me not take other good men not so good as thou desires,
  are not always consistent,
  do not always follow holiness,
  do not feel eternal good in sore affliction.
Show me how to know when a thing is evil
  which I think is right and good,
  how to know when what is lawful
  come from an evil principle,
  such as desire for reputation or wealth by usury.
Give me grace to recall my needs,
  my lack of knowing thy will in Scripture,
    or wisdom to guide others,
    of daily repentance, want of which keeps thee at bay,
    of the spirit of prayer, having words without love,
    of zeal for thy glory, seeking my own ends,
    of joy in thee and they will,
    of love to others.
And let me not lay my pipe
  too short of the fountain,
  never touch the eternal spring,
  never drawing down water from above.

The Valley of Vision "Self-Knowledge"