The person you see sitting in a chair wearing a blue suit, smiling and talking, you think is real. No, it is your impressions of him that are real for you. If you had no sight, you would not see him. If you had no ears, you would not hear him. Life comes in as impressions and it is here that it is possible to work on oneself—but only if you realize that what you are working on is not external life but the impressions you are receiving.
In this Commentary of Nicoll's, it seems that he randomly mentions a person wearing a blue suit, in order to illustrate his point about impressions.
Sometimes such a seemingly arbitrarily detail that he gives us turns out to be of more than passing interest.
And in the spirit of seeking to use picturing to help the pondering and reflection on these ideas, it may be useful to look at other occurrences of Nicoll's mention of the colour blue in his Commentaries.
For example, speaking of a version of the symbol of Solomon's Seal, with a triangle pointing down from above overlapping with a triangle pointing up from below, Nicoll says,
If one triangle were cut out of blue glass and the other out of yellow then there would be two blue and two yellow areas and a middle green area where the colours mingled.
Commentaries, Vol.II, p.475
One could picture blue sky above, yellow earth below, and the green of organic life on earth, beginning with green vegetation receiving and transforming the sun's rays.
