"Perfect love casts out fear." It is not be thinking ourselve sright that we cease to fear. It is simply by loving, and abandoning ourselves to the One whom we love without returning to self. That is what makes death sweet and precious. When we are dead to ourselves, the death of the body is only the consummation of the work of grace.
Seeing beauty in a flower could awaken humans, however briefly, to the beauty that is an essential part of their innermost being, their true nature. The first recognition of beauty was one of the most significant events in the evolution of human consciousness. The feelings of joy and love are intrinsically connected to that recognition. Without our fully realizing it, flowers would become for us an expression in form of that which is most high, most sacred, and ultimately formless within ourselves.