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.

2880. Nothing else seems to a person to be that person's, that is, to be properly his own, except that which flows from freedom. The reason is that all affection that exists within love constitutes his inner life itself; and when someone acts from affection he does so from his life, that is, from himself and so from what is his, that is, properly his own. In order therefore that a person may receive a heavenly proprium such as angels in heaven have, he is maintained in freedom, and by means of the freedom is introduced into it in the way described already. Anyone may see that when worshipping the Lord in freedom one seems to do so from oneself, that is, from what is properly one's own, but when worshipping under compulsion one is not doing so from oneself but from some outside influence or from some other source that forces one to do it. Thus anyone may see that worship offered in freedom is worship itself, but worship offered under compulsion is not worship at all.