Of all sins, that humanity ever made, well, all are irrelevant
before this one, the ever-damned bane of man, the antithesis
of Exalted Sophia, the one that is called the Ignorantia.
The term "Ignorantia" (lat. Ignorance) itself has a very broad
meaning, depending on the specific context of situation, but 
for all instances, and for all I care, the simplest explanation
of it is:

The lack of knowledge, in conjunction with indisposition to 
gaining knowledge, and wilful or unconscious refusal to 
acknowledge facts about reality either those of mundane
intellectual or spiritual realm.

And while the Ignorantia is mostly harmless, as for example
children know very little, thus are ignorant of a lot of
problems that can be encountered during life (but children
are also very curious about world, and willing to learn
which redeems them, that's why Ignorantia in children is
called Ignorantia Innocua), the real threat starts, when
ignorant person becomes malicious, at this point we begin
to call it Ignorantia Malevolens, the definition of which
shall I reveal to you is:

The lack of knowledge, in conjunction with indisposition to
gaining knowledge, wilful and/or conscious refusal to acknowledge
facts about reality either those of mundane, intellectual or
spiritual realm, which leads to moral and/or physical harm
inflicted upon oneself, or any other member of society one 
lives within.

So to recollect our knowledge until this point, Ignorantia
is the hypostasis of I. Innocua and I. Malevolens.
As far as my observations led me, children are MOSTLY guilty
of I. Innocua, and adults are MOSTLY guilty of I. Malevolens,
but that is not a rule, children can be wilfully and conciously
malevolent, and adults can make genuine mistakes based on
forgetting or not knowing something, this happens.

But then, if only those three sins are the core of all evil
in the world, then what about those seven sins, which ICXC
talks about. Do not quiver in fair, but quiver of excitement
Wisdom-seeker, for I shall lift the veil of secret on this
matter for you.
I had a good reason to say, all the other sins are irrelevant,
because, all sins, that are not Ignorantia, stem from it.
While not apparent in every case, let us put on our workbench
the biblical Pride. To begin with, I think "pride" is a wrong
term for a sin, which ICXC meant, but you know, it's not easy
to translate biblical hebrew to english, so we can overlook that.
The more appropriate word would be "arrogance" - Arrogantia.
Having that clear, let's take Arrogantia apart!
A simple explanation of Arrogantia could be:
Ignorantia Malevolens where harm is usually moral - a person
perceives themselves better, either based in morality, 
intellectual abilities, social and/or financial status, or on
or myriad of other things you can feel better than others
about, where harm is usually inflicted by verbal and
gesticulation means.
So considering the definition the definition of I. Malevolens,
and given definition of Arrogantia, which is actual definition
of arrogance which I found in my encyclopaedia and paraphrased,
we can, I think easily conclude that Arrogantia is Ignorantia in
Malevolens domain. To put it more clearly, I shall devise you a
graph, Wisdom-seeker, hence behold:

      Ignorantia
           |
           v
   Malevolens domain
           |
           v
      Arrogantia

All right, we covered how sins derive from each other, a question
might arise in your mind, oh Wisdom-seeker, "But Ignorantia can be
unconscious, so I might not even know I sin, what now?". Fear not,
for I also have an answer for that. The key is to learn. In order
to redeem your sin (oh Sophia Excelsa, it sounds so pompous), you
have to learn - do the work of uniting with Sophia. Repenting
is also important, but do not repent too much or it will hinder
learning and logic abilities. But what to learn? Learn what is your
fault. Have you hurt (verbally) your spouse? Take a walk, and think
what you said, and why did it hurt, and when emotions calm down,
talk to them, for communication in relationship is of utmost
importance. Have you failed in job? Then think what you did wrong 
in this case, and do not repeat the mistake in the future.
"And what if I already learned all of this?". Well then, take
action to redeem yourself in eyes of other people, or your own.
Say sorry to your hurt spouse, and compensate to them for your
ignorance. If you hurt yourself, compensate to yourself, learn
something new. Have a book you always wanted to read, but had no
time to do it? "Punish" yourself by taking some time to read.
After all, learning about world, even the smallest things,
often bring happiness and satisfaction, and is a way to connect
with Regnum, which puts you into union with Sophia, furthering
your part of work in Constant Creation.

With these words fare well, Wisdom-seeker, and may fate work in
your favour.

Addendum:
Ignorantia Innocua - Ignorantia, but without the indisposition
and wilful refusal, the refusal is unconscious.