mid 16th century (also in the sense ‘not falsified, unadulterated’): from Latin sincerus ‘clean, pure’.
Clean with out impurities , nothing extra just clean…
So many things are like this , sometimes we dismiss them, things such a crisp Autumn morning.
It just there at your door step welcome you to the day and offering you what it is. It does not care what it gets in return is just giving you the sincerity of a day in a season of the year not more not less.
Breathing its air fills your lungs with the purity of life, there is not need to alter it to your convenience , the peaceful feeling that is real and you can observe it and feel it and take it all in with out a fee is enough to reassure you that this is the way forward in life.