Whitehead on Plato

Some reflection is needed to interpret this famous utterance:  The renowned British philosopher A.N Whitehead once commented on Plato’s thought: “The safest general characterization of the European philosophical tradition is that it consists of a series of footnotes to Plato. I do not mean the systematic scheme of thought which scholars have doubtfully extracted from his writings. I allude to the wealth of general ideas scattered through them.”