One difficulty is that almost all of what is called behavioral science continues to trace behavior to states of mind, feelings, traits of character, human nature, and so on.
（2002-61） One difficulty is // that almost all of [what is called behavioral science ]continues to trace behavior to states of mind, feelings, traits of character, human nature, and so on.
difficulty is that almost all of what is called behavioral science continues to trace behavior to states of mind，feelings，traits of character，human nature，and so on.
His love of conversation, his affection, his indifference to riches, even his garrulity, are interesting traits of character.
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