In my study of Mathew 20 I find that there is a lot of work to do in the kingdom of heaven.  This work is hard and everyone, regardless of performance, is promised the same reward...eternal life in heaven.  Jesus knows we may not like this hard work and what is going to happen but he wants us to relax...it will be ok...he is the King.  We think we are strong enough to bear this work load but we are not able to without Him.  Jesus is our King and yet he serves us...as an example of how we are to work.  He understands better than we do and has compassion on us when we are hurting; we just need to be faithful and follow him.

Eph. 3:16-21

...That according to the riches of his glory he may grant you to be strengthened with power through his Spirit in your inner being, so that Christ may dwell in your hearts through faith--that you, being rooted and grounded in love, may have strength to comprehend with all the saints what is the breadth and length and height and depth, and to know the love of Christ that surpasses knowledge, that you may be filled with all the fullness of God.  Now to him who is able to do far more abundantly than all that we ask or think, according to the power at work within us, to him be glory in the church and in Christ Jesus throughout all generations, forever and ever. Amen.