Intro: C 

verse 1 (Bass vocals hum the chords; piano plays a static C note): 
         C 
You take two steps forward and three steps back 
On a journey of a thousand miles 
And you cry and you pray 
But you know at this pace you never will arrive 

verse 2 (Piano starts playing chords): 
       F            Am   G      C               Am 
Well I know in your heart you believed from the start 
          F                    G       Am 
God had a purpose He knit you together for 
             F             Am   G 
But life has pulled at the seams 
           C   Am 
And you're unraveling 
        Dm7                       C 
And you can't hold it together anymore 


[Refrão]
    F       G                        Am 
But God will, He will finish what He started 
   F                     G 
No thread will be left unwoven 
C                      Am 
Nothing will be left undone 
      F                G 
Every plan and every purpose 
        C               Am 
That He has will be accomplished 
    Dm7      G                F 
And God will finish what He's begun 

verse 3: 
                     F       Am  G     C            Am 
And it may feel like 40 long days in a hard driving rain 
      F             G       Am 
Or 40 years in a dry desert sand 
              F                Am  G 
But when He's finished we will SEE 
  C             Am 
A beautiful tapestry 
              Dm7                            C 
And know that nothing has been wasted in the end 

(Chorus) 

Bridge: 
F  Am 
F                                Am 
  And we'll stand as the ones completed 
                      Dm7 
By the miracle of His love 
                      Em7                  F 
We'll sing of His goodness and sing to His glory 
               Am    G 
As we tell the story of how 

(Chorus) 

I'm not sure about the outro, but it sounds like he's mostly playing an F chord.