The author of your hope – if you are a Christian – is God. He fills you with joy and peace “in your believing.” He desires for you to “hope in abundance.” You must recognize your hope comes “through the power of the Holy Spirit.”
Perhaps you try to generate this joy and peace and hope through sheer will-power. Stop trying so hard. Jesus says, “I Am the Way, the Truth, and the Life.” He says, “I have come that you may have life, and that abundantly.” He promises, “I go to prepare a place for you, and if I go to prepare a place for you, I will come again. If it were not so, I would have told you.”
Therefore, Paul prays:
May God, the author of our hope, fill you with all joy and peace in your believing; so that you may have hope in abundance, through the power of the Holy Spirit.