Elena is right. Emotional resilience stems from Bowlby's attachment theory and is a very old theory although it has been developed by different people such as Bowlby's own son, David Howe, and psychologists like Dan Hughes. In a nutshell, a child becomes 'emotionally resilient' through receiving emotionally warm, consistent parenting from birth. If an infant's needs are met consistently, that infant grows up to see the World as a safer place (s/he develops secure attachments) and thus can usually deal with life's adversities more efficiently. Research shows that such children develop healthier relationships, do better at school and later are more confident and 'balanced' adults. They are also able to promote secure attachments in their own children. However, if a child's needs are met inconsistently, or infrequently (s/he develops insecure attachments), that child usually grows up to see the World as an unsafe or even threatening place and can struggle later on with relationships, trust issues, addictions and educational achievement. This does not mean either, that someone with insecure attachments doesn't achieve well educationally or at work. Some of the highest achievers have insecure attachments, but this is not really a good thing - their insecurities drive them! Additionally the consistent care referred to earlier, does not have to come from a parent; it can come from any carer as long is it remains consistent. Usually a child forms her/his attachments within the first three years of life, so warm, consistent parenting is vital during that period. Insecure attachments might also be 'disconfirmed' if a child or adult receives regular loving care later on. Yes, it's all very complex but being emotionally resilient means we view ourselves and the World more positively. I'm fairly sure jinglbellsfrocks book would have been about the same issues.