“There is no better measure of love than trust” (Meister Eckhart).
The more we trust God, the more we love Him. We can understand this measure well and use it to examine the state of our love. The same can be said in reverse: the less we trust, the less love has triumphed in us. If there is even mistrust in our heart, it is a sign that our heart is closed and our relationship with our Heavenly Father has darkened.