Sorry. Neither the short quote nor the whole quote register with me.
There’s always stronger and weaker in different ways around you. Mercy is necessary because all of us have some point in our lives that we need the mercy of another to continue.
It may be delusional to believe that one will be taken care of for life; but it is more delusional to believe that one CAN “be an island” that stands alone.
Nobody stands alone. They may be lonely but human interaction requires some level of cooperation.
So, no; the quotes don’t register with me as rational but perhaps defeatist.