9460. 'From everyone whose heart is willing' means that all things should be offered out of love, and so in freedom. This is clear from the meaning of 'whose heart is willing' as in freedom. The reason why offering them out of love is meant is that all freedom is rooted in love; for what a person does out of love he does in freedom.

'Heart' has to do with love because it has to do with the will, see 7542, 8910, 9050, 9113, 9300.

All freedom is rooted in love or affection, 2870-2893, 3158, 9096, and this is why all worship must be offered in freedom, 1947, 2880, 2881, 7349.

9113. Conscience in a member of the Church is formed by the truths of faith received from the Word, or from religious teachings drawn from the Word, according to his acceptance of them in his heart. For when a person has a knowledge of the truths of faith and understands them in his own particular way, and then wills and does them, conscience takes shape in him. Acceptance in the heart is acceptance in the will, for a person's will is what is called the heart.