"Yin and yang, male and female, strong and weak, rigid and tender, heaven and earth, light and darkness, thunder and lightning, cold and warmth, good and evil...the interplay of opposite principles constitutes the universe."

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You select the colors of your thoughts; drab or bright, weak or strong, good or bad. You select the colors of your emotions; discordant or harmonious, harsh or quiet, weak or strong. You select the colors of your acts; cold or warm, fearful or daring, small or big.

— Wilferd Peterson