When growing up, I learnt the song, Trust and Obey, for there is no other way to be happy in Jesus but to Trust and Obey. But it was not until recently that I learned from the Bible that Trust and Obedience are like two sides of the same coin. After one places their trust in Jesus, they must Obey Him.  This is the next step that one must take after they believe in the Lord Jesus Christ according to the Scripture to inherit eternal life (Hebrews 5:9). Not every one that saith unto Him, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth (obeys) the will of my Father which is in heaven (Matthew 7:21). Beyond belief comes obedience.

Points to ponder:
Have you/I believed in Jesus Christ? If you/I have, do you/I obey Him and do the will of God the Father? 

Hebrews 5:8-9 (KJV)
8 Though he were a Son, yet learned he obedience by the things which he suffered;
9 And being made perfect, he became the author of eternal salvation unto all them that obey him;