The worldly wise live by the probable and not by the possible. It is possible that you will reform the person you want to marry. But it is not probable.
Don't imagine that you can change a person in any significant way. What you see now in your partner is what you will get from here on out. People don't change. They are what they are. The few exceptions prove the rule. The wise live by rules, not exceptions, by probabilities, not possibilities. "Probability is the very guide to life." (Bishop Butler quoting Cicero, De Natura, 5, 12) It is foolish to gamble with your happiness. We gamble with what is inconsequential, what we can afford to lose. So if there is anything about your potential spouse that is unacceptable, don't foolishly suppose that you will change her. You won't. You must take her as she is, warts and all, as she must take you.
The principle applies not only to marriage but across the board.
The onus probandi is on the extremist in matters of belief. Extreme beliefs bear the burden of proof. There is a defeasible presumption in favor of moderate views just as there is a defeasible presumption in favor of traditional ways of doing things. Note the qualifier, 'defeasible.'
Too many of the academic philosophers of consciousness are overly concerned with the paltriest aspects of consciousness, so-called qualia, and work their tails off trying to convince themselves and others that they are no threat to physicalism.
While man's nobility lies in the power of thought whereby he traverses all of time and existence, our materialists labor mightily to make physicalism safe for the smell of cooked onions.
Although the world runs on appearances, a fact well to be heeded by anyone who plans to hang out long in these sublunary precincts, the task of the philosopher is to penetrate seemings, whence we may conclude that it is unseemly for a philosopher to be much concerned with the seemly and the unseemly.
Much of religion is overbelief, but much of science is underbelief. One sees less than is there; one sees only what one's restricted method allows one to see. Examples are legion. Find them.
For more on overbelief and underbelief, see the first two articles below.
You are sliding down a mountain towards certain death. Your only hope is to grab the rope that is thrown to you. Will you refuse to do so because the rope might break? Will you first inquire into the reliability of the rope or the credibility of the assurances of the one who would be your savior?
People can and ought to be judged by the company they keep, the company they keep away from, and those who attack them.
Addendum (6/23):
S. N. counters thusly:
For John the Baptist came neither eating bread nor drinking wine, and you say, ‘He has a demon.’ The Son of Man came eating and drinking, and you say, ‘Here is a glutton and a drunkard, a friend of tax collectors and sinners.' (Luke 7.33-4)
God incarnate can safely consort with gluttons and drunkards and the lying agents of the Infernal Revenue Service, but mortal man cannot. So one who does so consort ought to be judged by the company he keeps. The judgment might be along the following lines, "You are morally weak, and you know you are; and yet you enter the near occasion of sin?"
This leads to a question about "Judge not lest ye be judged." How is this NT verse at Matthew 7, 1-5 to be interpreted? Is it to be read as implying the categorical imperative, "Thou shalt not judge others morally"? Or is it to be interpreted as a merely hypothetical imperative, "You may judge others morally, but only if you are prepared to be judged morally in turn and either condemned or exonerated as the case may be"?
The first reading is not plausible. For one thing, one cannot detach the antecedent or the consequent of a conditional in the way one can detach the conjunct of a conjunction. Compare 'If you don't want to be judged by others, don't judge them' with 'You don't want to be judged by others and you don't want others to judge you.' The categorical imperative 'Don't judge them' does not follow from the first. The declarative ' You don't want others to judge you' does follow from the second.
But now a third reading suggests itself to me, one that in a sense combines the categorical and the hypothetical, to wit, "You may judge others morally, but only if you are prepared to be judged morally and condemned by God, since no man is justified before God." This is tantamount to a categorical prohibition on judging.
I suspect the third reading is the correct one in the context of Christian teaching as a whole. But I'm no theologian.
Jean-Paul Sartre put the following into the mouth of a character in the play, No Exit: "Hell is other people." What then would hell be for philosophers? To be locked in a room forever with a philosopher with whom one has little or no common ground. David Stove and Theodor Adorno, for example. Or Sartre and Etienne Gilson.