In the Word three terms are used to refer to bad actions: transgression, iniquity, and sin. Transgression is the least bad. It means a violation of what is true in an external context, a violation of what is right and orderly. Iniquity is next and denotes acts that violate more interior truths. Sin is the worst. It is a violation of what is holy and righteous, a violation against the Lord. Sin is the deepest kind of evil. Regarding iniquity -- to be in charity, or live a life of charity is to live a life where the acts and thoughts that have top priority are those that have within them a love for the neighbor. Sometimes our love of self, our inborn desire to put ourselves first, is stronger than our charity and we do something for ourselves at the expense of our neighbor, or even do harm to our neighbor. Such an act, if our motive is selfish, is an iniquity.

(Reference: Arcana Coelestia 9156, 9965 [2-3])

8867. 'You shall not have other gods before My face' means that there must be no thought about truths from any source other than the Lord. This is clear from the meaning of 'gods' as truths, and in the contrary sense as falsities, dealt with in 4402, 4544, 7268, 7873, 8301; and from the meaning of 'face', in a reference to God's face, as love, mercy, peace, and goodness, dealt with in 222, 223, 4311, 5585, thus the Lord Himself, since the Lord is the Source from which these spring. The reason why 'there must be no other gods before My face' means that there must be no thought about truths from any source other than the Lord is also that the Lord's Divine Human, meant by 'I am Jehovah your God', is mentioned first, which is therefore first in line and must reign universally in each individual truth that follows, 8864, 8865. Consequently the commandment now declares such things as are to be avoided because they are thoroughly destructive and prevent the Lord from reigning universally in each and every truth contained in the commandments and statutes that were dictated and commanded from Mount Sinai. The first thing that would be destructive is thought about truths from a source other than the Lord, which is meant in the words that prohibit the presence of other gods before the Lord's face. All other things which would destroy that truth reigning universally are contained in the prohibitions that follow in sequence - that they were not to make a graven image for themselves; that they were not to make any likeness of the things that were in the heavens, on the earth, and in the waters and that they were not to bow down to them, and not to serve them. And after these therefore comes the reiteration 'for I am Jehovah your God', meaning that the Lord must be in every single one.