But I know the times I don't have one myself. (Para. 7)
Meaning: But I know the times when I don't have a "good heart" myself.
Notice that in the sentence, the relative adverb "when" has been left out after "the times". This is common when the relative clause is modifying a time expression. Look at the following example:
The day I arrived was Thursday. 我到的那天是星期四。
The sentence is understood : The day that I arrived was Thursday; or The day when I arrived was Thursday; or The day on which I arrived was Thursday.