From Imitation of Christ:
A man is raised up from the earth by two wings — simplicity and purity. There must be simplicity in his intention and purity in his desires. Simplicity leads to God, purity embraces and enjoys Him.
If your heart is free from ill-ordered affection, no good deed will be difficult for you. If you aim at and seek after nothing but the pleasure of God and the welfare of your neighbor, you will enjoy freedom within.
If your heart were right, then every created thing would be a mirror of life for you and a book of holy teaching, for there is no creature so small and worthless that it does not show forth the goodness of God. If inwardly you were good and pure, you would see all things clearly and understand them rightly, for a pure heart penetrates to heaven and hell, and as a man is within, so he judges what is without. If there be joy in the world, the pure of heart certainly possess it; and if there be anguish and affliction anywhere, an evil conscience knows it too well.
As iron cast into fire loses its rust and becomes glowing white, so he who turns completely to God is stripped of his sluggishness and changed into a new man. When a man begins to grow lax, he fears a little toil and welcomes external comfort, but when he begins perfectly to conquer himself and to walk bravely in the ways of God, then he thinks those things less difficult which he thought so hard before.
What are you saying, My child? Think of My suffering and that of the saints, and cease complaining. You have not yet resisted to the shedding of blood. What you suffer is very little compared with the great things they suffered who were so strongly tempted, so severely troubled, so tried and tormented in many ways. Well may you remember, therefore, the very painful woes of others, that you may bear your own little ones the more easily. And if they do not seem so small to you, examine if perhaps your impatience is not the cause of their apparent greatness; and whether they are great or small, try to bear them all patiently. The better you dispose yourself to suffer, the more wisely you act and the greater is the reward promised you. Thus you will suffer more easily if your mind and habits are diligently trained to it.
Do not say: “I cannot bear this from such a man, nor should I suffer things of this kind, for he has done me a great wrong. He has accused me of many things of which I never thought. However, from someone else I will gladly suffer as much as I think I should.”
Such a thought is foolish, for it does not consider the virtue of patience or the One Who will reward it, but rather weighs the person and the offense committed. The man who will suffer only as much as seems good to him, who will accept suffering only from those from whom he is pleased to accept it, is not truly patient. For the truly patient man does not consider from whom the suffering comes, whether from a superior, an equal, or an inferior, whether from a good and holy person or from a perverse and unworthy one; but no matter how great an adversity befalls him, no matter how often it comes or from whom it comes, he accepts it gratefully from the hand of God, and counts it a great gain. For with God nothing that is suffered for His sake, no matter how small, can pass without reward. Be prepared for the fight, then, if you wish to gain the victory. Without struggle you cannot obtain the crown of patience, and if you refuse to suffer you are refusing the crown. But if you desire to be crowned, fight bravely and bear up patiently. Without labor there is no rest, and without fighting, no victory.
[resources: The Imitation of Christ]
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