Nothing happens without the sanction of Kṛṣṇa. But some may be of a different category : those things that happen due to our previous karmas not sanctioned by Kṛṣṇa. Therefore, depending on how we react to those things, we can also continue to advance in Kṛṣṇa consciousness. There are some things which are directly done by Kṛṣṇa, which is not according to the karma.
His Holiness Jayapataka Swami Maharaj
1988, 31st October, SB class @ Atlanta, USA