The ancients considered mechanics in a twofold respect: as rational, which proceeds accurately by demonstration, and practical. To practical mechanics all the manual arts belong, from which mechanics took its name.

What moved me was the theme of the harmony which is born only of sacrifice, the twofold experience of love. It's not a question of mutual love: what nobody seems to understand is that love can only be one-sided, that no other love exists, that in any other form it is not love. If it involves less than total giving, it is not love. It is impotent; for the moment, it is nothing.

Because God is holiness itself, we cannot be united to Him unless we are clean of heart--a state implying a twofold condition: atonement for the past and detachment from sin and the occasions of sin for the future.