1. Existence is perceived, which means that everything is perceived as existing in the heart, and nothing can exist outside the heart. Becquerel called all kinds of things ideas (so the usage of this word is different from that of ordinary people in these philosophers). One of the important reasons is that thoughts exist in the spirit.

2. Being is perceived from Bishop Becquerel's famous words. as soon as...

3. The subject "existence" in "perceived existence" does not mean the existence of everything. Becker said that the existence of spirit (or mind, soul or self) is imperceptible, but although it is imperceptible, Becker said that spirit exists. So the "existence" in this sentence refers to everything except spirit, so the complete expression should be: except spirit, existence is perceived.

Strictly speaking, Becquerel didn't say "Being is being perceived", but cut it out of the sentence. Therefore, in order to understand its meaning correctly, we should not only look at this sentence, but also pay attention to what Becquerel said before and after.