To credit or blame others for the success or failures in your life means you aren’t looking within yourself.
You play a big role in what happens in your life. Ultimately it is up to you as to what you do, the success you have and the failures that you have.
To credit someone else means you aren’t acknowledging the knowledge, experience or will power that you have within yourself to make things happen.
To blame someone else means you aren’t taking responsibility yourself.
It’s easy to blame or credit others, but you first have to look within yourself and acknowledge what is going on.