Just to note, Clint Eastwood came from a wealthy family, lied to friends about his military background (he was in the military, but as a lifeguard at a post near Monterey), and got his first break through a friend, because his acting was (previously) heavily criticized and he couldn't get work.
So, it seems like a lot of people gave him a lot of "darn things", whether he appreciated them at the time, or even recognizes that impact, or not. I think it's more important for people to be grateful, and to recognize the ways in which people help them/have helped them, however "normal" or expected or insignificant that help may seem (because even if it seems normal, even if it's the same help that all of your friends/everyone you knew growing up got... there are many people, outside of your own bubble, who never got that help). Because EVERYONE needs help... it's just that the more help people get, the less they seem to recognize the importance of the help they've gotten. Everyone likes to think of themselves as someone who's struggled and earned what they've achieved... and in that narrative, people tend to unwittingly delude themselves and focus only on their own achievements, taking for granted the ways people have helped them to at least open those doors and make those achievements possible. Clint Eastwood is a great example of that.
Hard work is important. If you want something, work for it. But you can't discount the importance of luck, and more importantly you can't dismiss the significance of the ways in which people have helped you.
Also, I think people are "owed" things, to some degree. Parents owe it to their children to provide the best life possible and give them the best start in life, when entering adulthood. Just how much help that is may vary, depending on the parents' own resources/abilities, and that's fine. What's important is that people do the best they can, and that parents help their children in the best way they can (however modest). Clint Eastwood's parents helped him a lot - in ways most parents couldn't help their kids even if they wanted to, for lack of resources... most of us couldn't habitually skip high school classes, and eventually dropped out, while our parents give us money to go out partying for a few years - yet this is EXACTLY the case for Clint Eastwood (he skipped class, eventually dropped out, and his parents gave him money to basically just spend on partying, until he was eventually drafted... seems he thought they owed him a lot, eh?). Also, I feel like statements like this are a way to ignore accountability... You could argue that someone isn't owed anything and they need to work hard, but so often statements like that are used to deflect accountability... i.e. a corporation says they need subsidies and tax breaks (public assistance) to create more jobs, but then when those jobs aren't created, or they're low-paying, or that company decides to take all that money they got from that public assistance and off-shore half their workforce... they're accountable for that, or at least they should be. You can tell the people affected by that (who lost their jobs, etc...) to work hard to make ends meet regardless, and that's fine (and fair) - but it's not reasonable to act like the situation that got them in that position was just some act of God...
So, I think 1.) people need to be grateful and make a point of RECOGNIZING what they've been given (something so many people forget to do, and unconsciously take it for granted), and 2.) people need to be accountable and hold others accountable for their actions that negatively affect others. Some hard work to be successful with those factors accounted for... well, that definitely helps, and is pretty good advice.
And Clint Eastwood is a raging hypocrite who, again, dropped out of high school while his parents threw money at him so he could go out partying, working odd jobs here and there.