Every scientist, through personal study and research, completes himself and his own humanity. ... Scientific research constitutes for you, as it does for many, the way for the personal encounter with truth, and perhaps the privileged place for the encounter itself with God, the Creator of heaven and earth. Science shines forth in all its value as a good capable of motivating our existence, as a great experience of freedom for truth, as a fundamental work of service. Through research each scientist grows as a human being and helps others to do likewise.

The ecological crisis is a moral issue.

Open your minds and hearts to the beauty of all that God has made and to His special, personal love for each one of you.

Violence and arms can never resolve the problems of men.

To reach peace, teach peace.

Treating a person as a means to an end, and an end moreover which in this case is pleasure, the maximization of pleasure, will always stand in the way of love.

Christ remains primary in your life only when he enjoys the first place in your mind and heart. Thus you must continuously unite yourself to him in prayer.... Without prayer there can be no joy, no hope, no peace. For prayer is what keeps us in touch with Christ.