Imperfections and venial sins cannot deprive us of spiritual life; it is lost only by mortal sin. Fortunately for us, in this war we are always victorious provided that we are willing to fight.
Francis, like many of the saints, wants to encourage us on the spiritual journey. This is a journey on which we are all called to embark; and God will give us the grace to make progress on this journey, if only we are willing to persevere, to fight the good fight.
As for the seed that fell on rich soil, they are the ones who, when they have heard the word, embrace it with a generous and good heart, and bear fruit through perseverance. (Lk. 8:15)