Knowing the Cost of Redemption (Luke 22:39-46; LD 4)

When we think about Redemption we can take things for granted that we should not take for granted.  We can look at the work of Christ and minimize what it cost.  How much did it really cost Christ to accomplish our redemption? How hard was it really for Christ the God man to redeem us?  I mean He is God so what is the real challenge?  How can redemption be something that is horrible for Christ when God is glorified in the midst of it?