Many people find it easy to say when things are going well that “all suffering is from Heaven.” They find it easy to quote the gemara (Chulin 7b) that one does not bang his finger unless it was already decreed from Heaven.
Nevertheless, when they do actually bang their fingers, they forget everything they know about the positive aspects of suffering.
What they say is not consistent with what they have internalized and made part of their everyday thinking. Therefore, we must work on repeating to ourselves again and again important concepts so that we will react accordingly. ~ Ohr Yohail (Vol 3, P. 98)