Valmiki Ramayana Ayodhya Kanda Sarga 62 Shloka 16

रिपुहस्तः from the enemy's hand, आपतितः suddenly fallen, प्रहारः blow, सोढुम् to endure, शक्यः possible, शोकः grief, सुसूक्ष्मोऽपि however slight, सोढुम् to endure, न शक्यते not possible.

One can endure an unexpected blow from the enemy's hand but to endure unexpected grief, however slight it may be, is impossible.