A song says trust and obey for there is no other way to be happy with Jesus , just to trust and obey. Taking to what the topic is saying implies that obeying the Commandments of God as written in the scriptures, trust ing God with His words, with that He will direct our paths.
Let's look at the life of David , God Said His a man after my heart because David followed the right path , which entails that David trusted God in all things and that made God to be in charge of David's life. When you follow the right path the owner of your life now becomes your driver and you are His passenger.
Serving entails total surrender to God and be ready to listen and obey Him. The blessings of God comes when you adhere to His instructions and with that we will enjoy His divine wisdom, expansion and grace.