For behold, thus saith the Lord God: I will give unto the children of men line upon line, precept upon precept, here a little and there a little; and blessed are those who hearken unto my precepts, and lend an ear unto my counsel, for they shall learn wisdom; for unto him that receiveth I will give more; and from them that shall say, We have enough, from them shall be taken away even that which they have.

And Jesus increased in wisdom and stature, and in favour with God and man.

COMMENTARY

I will give line upon line, precept upon precept, here a little and there a little
And Jesus increased in wisdom and stature, and in favour with God and man
When it comes to commandments that we do not understand the reasons for, it is important to know that there is nothing wrong in our ignorance. There is no shame in saying “I do not understand why this matters.” As we see in these verses, it is the natural and expected course for us to learn one step at a time, which implies that we have not attained all knowledge yet. Even Jesus followed this pattern. Though he showed great wisdom in his youth, that does not mean he came to earth knowing absolutely everything. In fact the record showed that he learned and grew, just like the rest of us.
Consider, also, the example of a small child that has yet to learn addition. Yes, they need to learn that skill, it is important, but there is no shame that they have not attained it yet. For now, mastering counting is sufficient for them.

For unto him that receiveth I will give more; and from them that shall say, We have enough, from them shall be taken away even that which they have
What would be concerning, though, is the child that refuses to learn to count, and by extension refuses to learn every higher form of mathematics. It is okay to not know all things, but it is not okay to stop learning.
It can be tempting to take what commandments we do understand and say “I’ll just keep these ones and not worry about the rest,” but that would be limiting ourselves. Neither should we look at the commandments that we do not understand and say “I feel deeply ashamed for my ignorance,” that would be abusive. As with so many things, the middle path is the right way forward. We can accept that we are ignorant, without shame, and also strive to grow past it.