自分も練習のためにやってみたけど、あまりに日本語が分かりにくいので語順変えた
自信はない

I sometimes call that my elder brother said over and over again,
" whenever you get the urge to show off your ability, you should remember
that not all the people have a favorable condition like you."
I have never done so, but I feel compelled to agree with him.

One day I encountered an impressive incident. It truly realized me that my natural
inclination easily to be smug in my power more or less deprived me of a chance
to explore the depth of my life more deeply.