If we pursue happiness directly we're never going to get it are we? We're pursuing it so we're perceiving it as something beyond us that we want but havent got, and while we're pursuing it this will always be the case. Happiness comes naturally out of other things like in your example of being in a loving relationship with Christ.
It is impossible for us to bear the fruit of joy on our own ! Why ? The Lord has explicitly told us :
I am the vine; you are the branches. Whoever abides in me and I in him, he it is that bears much fruit, for apart from me YOU CAN DO NOTHING. -John 15:5
Many have tried to create their own version of happiness, but no avail. It may outwardly that they will try to convey to others that they are happy but inwardly they feel ashamed to confess that they felt empty on the inside or just ignoring or suppressing or evading the truth. Why? They are distancing themselves from the life of God. But our Lord Jesus Christ, our Shepherd can restore our inner person, as we have heard:
He restores my soul. He leads me in paths of righteousness for his name's sake. -Psalms 23:3
Sin makes a person sorrowful. That is why the Lord comes to set us free from sin and that we be blessed having our offenses forgiven and our sins covered by His love that He poured at the cross.
We rejoice for having been forgiven and that our Lord makes us righteous on the account of His sacrifice before God.
we rejoice because we can now take refuge in His blood that we do not have to suffer the wrath of God.
I understand that there are those who suffer physically, emotionally and mentally in this land of the living and find no joy but this is what we have heard:
But REJOICE insofar as you share Christ's sufferings, that you may also rejoice and be glad when his glory is revealed. -1 Peter 4:13
Consider our sufferings ! Is it because we have done wrong or right ? When we have done wrong, the Lord gives His grace of repentance, in order that we may rejoice and living in His love. If we have done what is right, then we are suffering for righteousness’ sake or Christ’s sake ; we are told to rejoice.
If we don’t know whether we are suffering for what is right or wrong, we can ask the Lord for wisdom and understanding to guide us into all truth through His Spirit. Even in our suffering, we are not alone ; for the Lord is with us, as we take His yoke and burden; for the Lord daily bears our burden, as we have heard : Blessed be the Lord, who daily bears us up; God is our salvation. Selah -Psalms 68:19
Our Lord is truly compassionate toward us; that is why He understand when we suffer ! For we are not only SUFFERINGS ONLY FOR HIM, BUT ALSO WITH HIM.
See Jesus, our KING ; He is a compassionate KING, as we have heard what He has said in His words :
And the King will answer them, 'Truly, I say to you, as you did it to one of the least of these my brothers, you did it to me.' -Matthew 25:40
Who the King cares ? Even if we are the least of all the brethren, the King considers others who are compassionate on the account of us.
Can we not rejoice to hear what our King has said ?
I understand that many are struggling with sin in daily living ; those who despair in suffering cried why the Lord has to create the devil ? If there is no devil, we would not be sinning. To blame God for creating the devil is not the right response. By saying that, many unknowingly fall into the devil’s trap; the devil tries to make the cross that we have to carry is too heavy ! But it is not so ! For the Lord have given His grace to strengthen our hearts, and the Lord have weighed first whether we are able to carry ! Since we have taken the Lord’s yoke and burden, the Lord also bears up with us; for we have heard the Lord gives strength to His people in Psalm 29:11.
Even if we do away with the devil, all of us will be rewarded according to our deeds; that do not change. Inevitably, we all still need to face afflictions and sufferings.
But the Lord is good, and that He have considered all afflictions, sufferings and take away our sins. In this, we rejoice that the Lord turn to us and show us favor, and in righteousness, He brings out of distress.
This is what we have heard:
Although he was a son, he learned obedience through what he suffered. -Hebrews 5:8
For we who have received the Spirit of God make us to be sons of God through Christ Jesus; as those who are led by the Spirit of God, we ALSO learn obedience through what we suffer.
Therefore, to be joyful, we need to pray like what the apostle Paul have taught us:
being STRENGTHENED with all power, ACCORDING TO HIS GLORIOUS MIGHT, for all endurance and patience WITH JOY; -Colossians 1:11
As we have heard to per server patiently in our sufferings and TO BE JOYFUL IN ANY SITUATION , we need the strength of our Father of grace in heavens which His Spirit supplies through Christ Jesus our Lord.
In sum, our joy would be complete only when the joy of the Lord is in us, as we have heard:
These things I have spoken to you, that my joy may be in you, and that your joy may be full. -John 15:11
How the joy of the Lord can be in us ? Unless we bring delights to the Lord !
What bring delights to the Lord ? This is what we have heard:
If you keep my commandments, you will abide in my love, just as I have kept my Father's commandments and abide in his love. -John 15:10
Therefore, our joy is derived from abiding in His love by keeping His commandments.