While we do not see Jesus right now, we will see him in that day of his revelation. Right now, we do not see him, but we believe in him. Perhaps, Peter has in mind here the words of Jesus in John 20:29 “Blessed are those who have not seen and yet have believed.”
We live in a culture that teaches us to pursue happiness. When our ultimate goal is happiness, we have an inability to pursue the greater things in life that lead to our glorification. The pursuit of happiness as ultimate will keep you from the goal of godliness and Christlikeness. Many times it is the exact opposite: it is the hardship and trial (not the happiness) that leads to our ultimate good.
Consider the words of 1 Peter 1:
1Pet. 1:6 In this you rejoice, though now for a little while, if necessary, you have been grieved by various trials, 7so that the tested genuineness of your faith—more precious than gold that perishes though it is tested by fire—may be found to result in praise and glory and honor at the revelation of Jesus Christ. Though you have not seen him, 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.
First, notice that the larger goal is that we rejoice even if we are grieved in various trials. Trials will come to your life as a Christian, a Christian without trials may not be a Christian (Rom. 8:17). If the Son suffered, his sons (and daughters) will suffer in various trials. This theme is in numerous placed in the New Testament.
The Christian does not face his trials in a detached stoicism.