The Lord allows the enemy to tempt us in order to prove us, in order to strengthen our spiritual powers in our struggle against the enemy, and so that we ourselves may see more clearly towards what our heart inclines, whether it inclines to patiences, hope, and love and in general to virtue, or to irritability, incredulity, murmuring, blasphemy, malice, and despair. Therefore we must not be despondent, but must good-humoredly and patiently bear spiritual darkness that descends upon our soul, the fire that weakens and inclines us to impatience and malice, the affliction and oppression, knowing that all these things are indispensable in the order of spiritual life, that by these the Lord is proving us.
Do not let us blaspheme against the true way – the way of holy faith and virtue, and do not let us prefer the evil way. We are free, and must strengthen ourselves by every means and with all our power in faith and virtue, unto the laying down of our life for the way of truth; and how can this be if we have no temptations? (St. John of Kronstadt, My Life in Christ, pp. 189-190)