Our individuality carries us from earth life to earth life. To study look at the basis of your human soul and the forces that work within your being. Our personality on the other hand is formed within one life by all that we experience. To study we must see how the essential kernel comes to expression in our choice profession for example. Goethe studied the archetype of the plant and he could see the plant within creating and growing, (as this was his gift to see the plant alive in his inner eye). Think of a model such as a seed that becomes a rose and like a growing flower we bring what our individuality had learned from previous lives. The fruit of previous lives is what we bring in the form of karma, gentle karma usually, unless we need a real kick in the butt. Through our individuality and personality we can always grow new flowers. When we work hard to develop a skill such as learning to play an instrument or learning a new language we are developing our personality which builds our individuality.