“Exercise caution in your business affairs; for the world is full of trickery. But let this not blind you to what virtue there is; many persons strive for high ideals; and everywhere life is full of heroism.” Max Ehrmann
As I see it, to consistently “strive for high ideals” IS heroism. We tend to lean toward defining heroism by results, but the person who jumps in the riptide to rescue a swimmer but drowns in the process is no less a hero than the one who accomplishes the task and survives – both had high ideals. So it may be just playing with sentence structure, but I would eliminate the “and” between “high ideals” and “everywhere.”
Indeed, “many people strive for high ideals” and that, in large part, sustains us all.
It occurs to me... 