Salvation is from our side a choice, from the divine side it is a seizing upon, an apprehending, a conquest by the Most High God. Our 'accepting' and 'willing' are reactions rather than actions. The right of determination must always remain with God.
True understanding is possible only when we are fully conscious of our thought, not as an operative observer on this thought, but completely and without the intervention of a choice.
I have a few minor rules for myself but I break them all the time. For example, when translating from Romance languages to English, there is often a choice between a Latinate cognate and a Germanic equivalent. An easy example would be the Portuguese escuridão: English offers both obscurity and dark or darkness, and some translators will tell you the Latinate word is generally reserved for poetic and figurative expressions, while the Germanic word is used for colloquial and idiomatic use.
The technique of positive thinking is not a technique that transforms you. It is simply repressing the negative aspects of your personality. It is a method of choice. It cannot help awareness; it goes against awareness. Awareness is always choiceless.
The question of place and climate is most closely related to the question of nutrition. Nobody is free to live everywhere; and whoever has to solve great problems that challenge all his strength actually has a very restricted choice in this matter. The influence of climate on our metabolism, its retardation, its acceleration, goes so far that a mistaken choice of place and climate can not only estrange a man from his task but can actually keep it from him: he never gets to see it.