A very practical and fundamental set of principles conducive to awakening are the four bases of spiritual power / success, in Pali iddhipāda. The SN has a whole chapter dedicated to the four iddhipāda but it does not seem it is has not been a priority of English translators (up to now, right bhante @sujato?! 
).
From what I have read and heard so far, these four things are very useful and important in one’s practice, representing a fourfold foundation for the unfolding of the path.
The fourth principle of this set, vīmaṃsā, called my attention as sounding like a powerful wildcard in the internal aspects of the path. This is what few teachers have to say about it:
(…) The fourth base of success is vimamsa, the one that’s most difficult to translate. It covers the mind’s ability to discern, its ability to be ingenious — in other words, all the qualities of active intelligence. If you see that something is not working in your meditation, use your imagination to figure out another approach that’ll get better results. You can make the breath deeper, you can make it more shallow, you can make it come in and out different spots in the body. There’s a lot to play around with here.
Source: “Basics”, a Dhammatalk by Ajahn Thanissaro
If you do it (practice) with a sense of desire (chanda) for the results, a sense of persistence (viriya), intentness (citta), and circumspection (vimansa), you can keep on doing it without getting tired. When you do your work with this attitude, you can keep at it always. This is why our teachers were able to live with a sense of contentment even when they were out in the mountain wilds.
Source: Right Attitude, by Ajaan Suwat Suvaco
Chanda: being content to focus on the breath.
Viriya: trying to adjust the breath so that it’s comfortable.
Citta: paying attention to how the breath is flowing.
Vimansa: knowing how to use the breath to benefit every part of the body.
If we follow these four “paths to success,” they will lead us to liberating insight.
Source: “Binoculars”, a Dhamma talk by Ajahn Lee Dhammadharo
(…)These four qualities are like preservatives: Whoever is saturated with them won’t go sour or stale. And when we’re free from going stale, our work is bound not to stagnate and so is sure to succeed. (…)These four qualities are ‘sacca-kamma’ — actions that give rise to truth, achieving our purposes. Those who bring these qualities into themselves will become true people. (…)
A good example of this is our Lord Buddha, whose actions gave rise to truth and who thus was able to establish the religion so as to benefit people at large. Even the body he left behind still serves a purpose for human and divine beings.
For instance, his bones, which have become relics, are still with us even though he gained total liberation a long time ago. As for his teachings, they have lasted for more than 2,500 years. And he himself is deathless, i.e., he has entered total nibbana.
All of this was achieved by means of truth, i.e., the four bases of success.
Source: “What is the Triple Gem?”, by Ajahn Lee Dhammadharo
The intention of this topic is therefore to explore how much do EBTs expand on the specific topic of vīmaṃsā and in a broader sense the whole of the four iddhipāda.