Since all people are different, there will be differences of opinion. However, there are certain things that can be done to create the image of honesty, trustworthiness, and support.
First, I would start with a picture. As they say a picture is worth a thousand words. So, some thought is necessary. The image of a rock in a sea of change is reassuring. For example, Prudential, the insurance company uses something like this. I would think along the lines of this, that is, think of a picture of something that does not change. This would show support and trust.
Second, in terms of colors. This is harder. Black and white gives the appearance of straightforwardness. It is the idea of what you see is what you get. You might want to explore this idea further.
Finally, in terms of quotes, there is so much that can be done. You might simply want to write the words that mean most to you such as: Trust, Honesty, Support. Another consideration is the font. I would choose something that is more traditional like Times New Roman.