Pride, ego, over-inflated sense of self-importance, self-exalting, (Exalting oneself) being puffed-up...
Go high, then sink low, then high, then low, and wonder... "Why" the lows...? Are you doing it to yourself...?
I used to think I wouldn't be able to survive, let alone thrive, or be able to live, without my pride... My entire (former) Identity was wrapped up in it, I was afraid to not have it, for fear of losing myself completely... But, it was causing all the deep lows, which was what I had to figure out (or more properly, what was revealed to me)...
Both are sin, both are very selfish and self-centered, which was another thing I had to learn (or was revealed to me)... I didn't know how to "let it go" or let go of it... I was to afraid... Afraid to die, spiritually, to let the old man die... But, I'm starting to "get it" now, with his help...
Both extremes are sin, and can cause you to sin even more, and both are very selfish, ultimately... I found I could live without it...
To "kill" it, it took the very low, low's... As much time as I spent on a high or in the high's and the height of the high's was dealt back to, in equal and opposite measure in and with the low"s... To kill it... And, to put a stop to it, till I started to catch on and learn (finally) (with his help)... The abundance of revelations made it hard also...
I had to learn what is stated in the OP... I learned or am learning it through trial and error and experience and with God's guidance and direction and help... I had to spend many times where I thought I was the lowest of the low, the worst of the worse, (to offset the high's was why)... The voices in my head would convict me of this... And, I had to agree and concede that I was better than no one and I mean no one... and still find a way with this in mind to feel and think good, but not high of myself...
But, I had to learn that it was all happening because of the "High's"... It was either a natural law or consequence that I was doing to myself, or, because of the high's, I was leaving or opening a door for the/my enemies to have ground or opportunity to pick on me, or beat me up a bit, leaving grounds for them to do so with God...
Anyways,
God Bless!