The desire for peace and joy is a right desire, but take heed that you do not seek the gift before the Giver, for that is to put the cart before the horse. There are many persons who have great joy and much peace who are not saved; their joy springs from a mistake, and their peace is the false peace which does not rest upon the rock of Divine Truth but upon the sand of their own imaginations. The peace of the devil is a deep sleep while the house is on fire. That is not what you need. Joy and peace are the soul's flower, and if you get faith into the ground, joy and peace will come of it. But if you get joy and peace first and say, "Now I believe," no you do not, it is not believing, it is the very opposite of it!
Do not think that a Christian always walks in perpetual ecstasy. I do not think that those poor disciples had any joy while Christ was in the grave. Their big sorrow swallowed up all joy. Yet now, consider this: your Lord desires that your joy may be full. He gives you a joy which no man takes from you, it is His legacy. But how does it come? The text stands firm: joy and peace always come through believing. You ask for peace and joy; I would point you to a deeper thing, that sacred faith which looks to Christ and brings joy and peace as a consequence.
Think much upon the suffering of your Savior. Christ was made perfect through suffering, and it is the blood of Jesus that whispers peace within. When the sorrows surge, bear your sorrow with Him and then see what peace, what perfect peace, you will enjoy. The man who has seen affliction, when he is blessed of God, has the disposition to cheer those that are afflicted. Our Lord obtained a blessing from suffering temptation and you may do the same. He enters into your trying experience very fully because His suffering, through being tempted, must have been much greater than any suffering that the purest-hearted believer can know. He knows this pain of yours. He took the suffering upon Himself, and now He is able to succor those who are tempted.
That peace which passes understanding is not merely a quiet feeling; it is a state of the soul rooted in God. "You will keep him in perfect peace, whose mind is stayed on You: because he trusts in You." If your mind is stayed on God He will keep you in perfect peace. You could not keep yourself in perfect peace in the hour of tribulation, or faintness, or decay, but the Lord can keep you. When heart and flesh fail, God will be your joy! Here is the secret: get right within and you will be right without. One of the best medicines for a good temper is communion with God and consequent joy of heart. Do not wait for joy and then trust; trust now, and joy shall follow as surely as the harvest follows the sowing.
Praying for peace and joy is not amiss, but let your prayer ascend to the throne of grace for the increase of faith. Ask that the Holy Spirit would fix your gaze upon Christ crucified, and keep your mind stayed there. For peace is a blessing, "The Lord will bless His people with peace." False peace is a curse, but to be soundly at peace with God is an unalloyed blessing. I may feel the cut of sharp, ungenerous words, or the weight of this inward suffering, but if my God speaks peace unto me, who can make trouble? "He will speak peace unto His people and to His saints." This is joy, indeed! Seek not merely peace and joy as abstract sensations, but seek Christ Himself. The Eternal Father says of Jesus, "He shall see the fruit of the travail of His soul." His shall be the praise, but yours shall be the great joy. Go now, and trust.