I feel that you are justified in looking into the future with true assurance, because you have a mode of living in which we find the joy of life and the joy of work harmoniously combined. Added to this is the spirit of ambition which pervades your very being, and seems to make the day's work like a happy child at play.
Respect your soul: don't keep repeating "I'm going to make it". Your soul already knows that, what it needs is to use the long journey to be able to grow, stretch along the horizon, touch the sky. An obsession does not help you at all to reach your objective, and even ends up taking the pleasure out of the climb. But pay attention: also, don't keep saying "it's harder than I thought", because that will make you lose your inner strength.
In the life of every man there are sudden transitions of feeling, which seem almost miraculous. At once, as if some magician had touched the heavens and the earth, the dark clouds melt into the air, the wind falls, and serenity succeeds the storm. The causes which produce these changes may have been long at work within us, but the changes themselves are instantaneous, and apparently without sufficient cause.
It is not just nature that defies us. Human life is as overwhelming... If we spend time in it [the vast spaces of nature], they may help us to accept more graciously the great, unfathomable events that molest our lives and will inevitably return us to dust.