Beatitudo, or perfect happiness, is a concept I learned in a philosophy class once. For life has many ups and downs, hellos and goodbyes, and good and bad days, but there is something that lies beneath all that where we can find peace and joy.
The Catholic Encyclopedia discusses: "Beatitudo, perfect happiness, complete well-being, is to be attained not in this life, but in the next. Primarily, it consists in the activity of man's highest cognitive faculty, the intellect, in the contemplation of God — the infinitely Beautiful. But this immediately results in the supreme delight of the will in the conscious possession of the Summum Bonum, God, the infinitely good."
While beatitudo is something fully possessed in Heaven, we have a foretaste of it on earth, and it is this very concept that transcends the sufferings of life. The possession of God carries us through and allows us to be truly happy no matter what storms shake us.
I think too that this possession of God extends to other people. For we see God in those around us--those closest to us, and so our happiness comes not only from God but the people He puts in our life. We in turn can be a source of joy to those same people.
So in what does perfect happiness consist? And how can we find it on earth amidst suffering? Blessed Margaret d’Youville says: "All the wealth in the world cannot be compared with the happiness of living together happily united." The key is union--our souls in union with God and our hearts in union with friends. Because one can only truly be happy by giving oneself to another, or rather that true joy shines the brightest in sacrifice and love.