Rav Avigdor Miller on The Generation of the Wilderness

Q: How can we understand the fact that dor hamidbar witnessed so many nissim in Mitzrayim and in the Midbar and still they tested Hashem as it says: וינסו אותי זה עשר פעמים ולא שמעו בקולי – “And they tested Me these ten times, and they have not listened to My voice” (Bamidbar 14:22)?