In 1911 he planned the Passion façade and in 1923 the definitive solution to the naves and roofs. The works advanced slowly, though, and Gaudí said: "There is no reason to regret that I cannot finish the church. I will grow old but others will come after me. What must always be conserved is the spirit of the work, but its life has to depend on the generations it is handed down to and with whom it lives and is incarnated".