Can someone pease me summarize this sentence asap

private schools by definition operate independently—they are not a common good. as a result, they’re generally not subject to rules holding them accountable for a certain level of student performance. no rules mean no agreed-upon measures, which mean no standardized assessments whose results parents and policymakers can consult. in other words, in an all-private-school world, there wouldn’t be an apples-to-apples way of judging the quality of individual institutions, which could have wildly different curricula and expectations.

Which lines from the speech best supports this topic sentence? and as we walk, we must make the pledge that we shall always march ahead. we cannot turn back. there are those who are asking the devotees of civil rights, "when will you be satisfied? " and they have come to realize that their freedom is inextricably bound to our freedom. we cannot walk alone. we refuse to believe that there are insufficient funds in the great vaults of opportunity of this nation. and so we've come to cash this check, a check that will give us upon demand the riches of freedom and the security of justice. and so let freedom ring from the prodigious hilltops of new hampshire. let freedom ring from the mighty mountains of new york. let freedom ring from the heightening alleghenies of pennsylvania.