Increasing our faith may take place during times when the presence of God is most evident. However, paradoxically, it is perhaps likely to take place when we are being sorely tested. It is at just those difficult times when we can learn to practise exercising faith when circumstances don't encourage us. But we need to practise exercising it by remembering in whom we believe.
we look not to the things that are seen but to the things that are unseen --Paul, Apostle to the Gentiles