When I asked Harry if he uses the Internet to look up old friends, "Let sleeping dogs lie" was his reply. His attitude, qualified, recommends itself.
The friendships of old were many of them mere friendships of propinquity. They were born of time and place and circumstance, and they died the death of distance, whether temporal or spatial or circumstantial. They are relics that can be fingered but not reanimated. They are best left in the boneyard of memory.
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?