This hits hard. Based Dostoyevsky.

"When I look back at the past and think how much time was spent in vain, how much of it was lost in delusions, in errors, in idleness, in the inability to live; how I failed to value it, how many times I sinned against my heart and spirit — then my heart contracts in pain. Life is a gift, life is happiness, each moment could have been an eternity of happiness. Si jeunesse savait! [If youth knew!]"