i don't know who wrote this but my praise leader taught me this
simplified version of it that sounds the same almost.

Capo 1st fret

Verse 1
Em         C             G                   D
Jesus I?ve forgotten the words that you have spoken
Em            C                G                    D
Promises that burned within my heart have now grown dim
       Em                  C       G                D
With a doubting heart I follow the paths of earthly wisdom
Em                C           G             D
Forgive me for my unbelief, renew the fire again

Chorus
Am    D     G                  G             C    D  Em
Lord  have  mer-               cy,  Christ  have  mercy
Am    D     G                  G   Cmaj7    D
Lord  have  mer-               cy  o-    n  me
Am    D     G                  G              C   D  Em
Lord  have  mer-               cy,  Christ  have  mercy
Am    D     G                  G    C       D   G
Lord  have  mer-               cy  o-       n  me

Verse 2
Em              C                G                    D
I have built an altar where I?ve worshipped things of man
Em           C                  G                 D
I have taken journeys that have drawn me far from You
Em         C               G            D
Now I am returning to Your mercies ever flowing
Em9            C               G           D
Pardon my transgressions, help me love you again

Chorus

Verse 3
Em               C            G               D
I have longed to know You and all Your tender mercies
       Em          C             G               D
Like a river of forgiveness ever flowing without end
     Em             C               G                D
So I bow my heart before You in the goodness of Your presence
Em                 C              G             D
Your grace forever shining like a beacon in the night


Repeat chorus to end song.  God Bless!