World's Toughest Crossword: Life

Quite recently, I (M) had a talk (when I was having a walk) with an elderly man (U) (though he did do the main talking). I am not going into the details of how the talk started, but gradually we ended up talking about what I am about to share with you now.

U: 'Many of us have heard our teachers/ elders telling us that there is no work in life which can be done without the help of math. Though that might arguably be true, but I am not going to harp on that point. Instead, I will talk about another important aspect in our life: CROSSWORDs (puzzle).'

M: 'What is this guy rambling about? I have better things to do than think about those silly crosswords... There are surely thousands who don't bother with such an annoying waste in time!'
U: 'True. If something along those lines (the above one) is coursing through your mind, then I am on your side.'

M: 'HA! From where to where is this talk going?'
U: 'Let me explain. Crosswords have been an integral part of our life, and there is no guarantee that a person proficient in solving the crossword puzzles on the papers (that you get to see every day), will be any better in solving the toughest crosswords experienced by us- LIFE!!!'

M: 'OKaayyyyyy!!!' -__- 'What does a dumb crossword have anything to do with Life?'
U: 'EVERYTHING! I neither know as to who introduced crosswords (the ones on the paper) nor why, but there can be a lot of similarities drawn between Crosswords and our lives.
Similar to crosswords, our life:
- Isn't a fairy tale (with smoothly curving paths, where one good thing leads to another with little or no worries).
- Has various blank (black) spaces which are outside our control.
- Has various clues as to how we proceed.
- The way we go about solving it determines as to whether we attain success or not.
- Once one is solved, there is always another to face the next day/ time.'

M: 'So, you say there are multiple crosswords in our lives, not just one symbolizing Life as whole?'
U: 'Yes and No. Yes, because as you said there are multiple crosswords we come across our lives, and no, because we can also consider our entire life as one huge crossword with all the smaller crosswords forming words as rows (across) and columns (down), something which arguably none have been able to solve. Therefore, solving few problems or overcoming certain obstacles, do not in any way guarantee a happy or successful life, as there are many more words/ crosswords to be solved. This is where, we have to prioritize, but I do not intend to discuss about priorities.'

M: 'Where else are these crosswords applicable?'
U: 'There are few other attributes which have the basis of a crossword, such as
Our DNA: There are innumerable researches working in this direction, in order to understand the importance of our DNA, though there is a general understanding, but to get a more in depth understanding, we try to make use of all the clues available.
Our character: All of us are unique in our own way, and in order to get a good understanding of an individual, once again we need to comprehend the clues we sense present in the individual.
Similarly, there are various other places where we have Crosswords ingrained.'

M: 'But we have heard similar lines, such as our life being full of puzzles...'
U: 'I agree. Crossword is only a type of puzzle and hence the same holds good. Life is a big puzzle, and those who take pains in solving it are the ones who taste sweetness at the end of their journey (even though if they haven't solved the whole thing).'

As I came back near my house, I finally said:
M: 'This has been a nice talk with you and I have learnt a lot'
While saying this I turned towards him only to find that he wasn't there...