The man who really loves the Lord, who has made a real effort to find the future Kingdom, who is really pained by his sins, who is really mindful of eternal torment and judgment, who really lives in fear of his own departure, will not love, care, or worry about money, or possessions, or parents, or worldly glory, or friends, or brothers, or anything at all on earth.

St. John Climacus

A Christian must be courteous to all. His words and deeds should breathe with the grace of the Holy Spirit, which abides in his soul, so that in this way he might glorify the name of God. He who regulates all of his speech also regulates all of his actions. He who keeps watch over the words he is about say also keeps watch over the deeds he intends to do, and he never goes out of the bounds good and benevolent conduct. The graceful speech of a Christian is characterized by delicateness and politeness. This fact, born of love, produces peace and joy. On the other hand, boorishness gives birth to hatred, enmity, affliction, competitiveness, disorder and wars.

St. Nectarios of Aegina

These eight passions should be destroyed as follows: gluttony by self-control; unchastity by desire for God and longing for the blessings held in store; avarice by compassion for the poor; anger by goodwill and love for all men; worldly dejection by spiritual joy; listlessness by patience, perseverance and offering thanks to God; self-esteem by doing good in secret and by praying constantly with a contrite heart; and pride by not judging or despising anyone in the manner of the boastful Pharisee (cf. Luke 18 : 11–12), and by considering oneself the least of all men. When the intellect has been freed in this way from the passions we have described and been raised up to God, it will henceforth live the life of blessedness, receiving the pledge of the Holy Spirit (cf. 2 Cor. 1 : 22). And when it departs this life, dispassionate and full of true knowledge, it will stand before the light of the Holy Trinity and with the divine angels will shine in glory through all eternity.

St John of Damascus 

If you would be victorious, taste the suffering of Christ in your person, that you may be chosen to taste His glory. For if we suffer with Him, we shall also be glorified with Him. Blessed are you if you suffer for righteousness' sake. Behold, for years and generations the way of God has been made smooth by the Cross and by death. The way of God is a daily Cross. 

St Isaac of Syria