Our joy in God is bound up with our trust in God. The two cannot be separated -- not ever. Trust is the backbone of joy. And joy is the outflow of trust in one who is fully Trustworthy.
We see this connection made throughout the Bible.
The Psalmist unites trust and joy:
But let all who take refuge in you rejoice; let them ever sing for joy. (Psalm 5:11a)
The Lᴏʀᴅ is my strength and my shield; in him my heart trusts, and I am helped; my heart exults, and with my song I give thanks to him. (Psalm 28:7)
For our heart is glad in him, because we trust in his holy name. (Psalm 33:21)
And the Apostle Paul unites trust and joy:
May the God of hope fill you with all joy and peace in believing, so that by the power of the Holy Spirit you may abound in hope. (Romans 15:13)
I know that I will remain and continue with you all, for your progress and joy in the faith. (Philippians 1:25)
Not that we lord it over your faith, but we work with you for your joy, for you stand firm in your faith. (2 Corinthians 1:24)
And the Apostle Peter unites trust and joy:
Though you have not seen him [Christ], you love him. Though you do not now see him, you believe in him and rejoice with joy that is inexpressible and filled with glory, obtaining the outcome of your faith, the salvation of your souls. (1 Peter 1:8–9)
This is only a bare sampling of texts, the point is made repeatedly in Scripture. Confident faith and joy are bound up together.
[Read the rest of the article at Desiring God.]