[Yifnvmzp]

This has been the first one that I couldn't grasp at all.

You're welcome Woodscooter

As I initially mentioned, the Iddhipada are probably the set of bodhi-pakkhiya-dhamma least discussed & least understood in Buddhism.

Upon reflection, I sense this is so because the use of the Iddhipada is the most subtle.

I sense the Iddhipada are about about the "quality" one applies to practise, which includes when practising the other bodhi-pakkhiya-dhamma.

My viewpoint here seems to accord with what Ajahn Buddhadasa said, that is:
The Dhamma tools can be further divided into two kinds: primary Dhammas such as the four satipatthana (foundations of mindfulness) and the supplementary Dhammas such as the four iddhipada (paths to success) and the four sammappadhana (right strivings). You ought to know these Dhammas so they can be applied correctly according to the circumstances of practice.

http://www.suanmokkh.org/archive/asiti/leg3.htm For me, I like the simple term "love" for chanda, that is, loving what one is doing is. When the term "love" is used, we can also introduce notions such as "compassion" being the driving or underlying motivation in our dhamma practice.

All the best with your studies. Have fun.

Element