I had a very perplexed non-Christian friend ask me how I could profess love and concern for someone who had caused deep hurt. As a man who has been hurt repeatedly by people he gave his trust to, he can't comprehend it. I think it really ticks him off I have peace while he is still stewing over a situation which he readily admits wasn't as hurtful. My answer is simple: It's the blessing of obedience. When you obey God, He does amazing things in your heart and life! Heartfelt prayer makes inward changes. Act in obedience and the feelings follow.
Asking God to bless them isn't something I readily "felt" like doing. I love my Almighty God, so I obeyed. In return for my obedience for sincerely asking blessings on my estranged relatives, He granted me great joy in my life, love for them, peace for myself, and spiritual growth. That's why His commands aren't burdensome. Once we follow through with what He's leading us to do, we realize His commands are of great benefit to us.
Luke 18:1 Then Jesus told his disciples a parable to show them that they should always pray and not give up.