Whatever the soul may think fit to do itself, whatever care and pains it may take, relying only upon its own power, and thinking to be able to effect a perfect success by itself, without the co-operation of the Spirit, it is greatly mistaken. It is of no use for the heavenly places; it is of no use for the kingdom – that soul, which supposes that it can achieve perfect purity of itself, and by itself alone, without the Spirit. Unless the man who is under the influence of the passions will come to God, denying the world, and will believe with patience and hope to receive a good thing foreign to his own nature, namely the power of the Holy Spirit, and unless the Lord shall drop upon the soul from on high the life of the Godhead, such a man will never experience true life, will never recover from the drunkenness of materialism; the enlightenment of the Spirit will never shine in that benighted soul, or kindle in it a holy daytime; it will never awake out of that deepest sleep of ignorance, and so come to know God of a truth through God’s power and the efficacy of grace.

St. Macarius the Great

To admire the labours of the saints is good; to emulate them wins salvation; but to wish suddenly to imitate their life in every point is unreasonable and impossible.

St. John Climacus

However, of this much we must be sure. Never by our sole diligence or zeal nor by our most tireless efforts can we reach perfection. Human zeal is not enough to win the sublime rewards of blessedness. The Lord must be there to help us and to guide our hearts toward what is good. Every moment we must join in the prayer of David: ‘Direct my footsteps along Thy paths so that my feet do not move astray’ (Ps. 16:5) and ‘He has settled my feet on a rock and guided my footsteps’ (Ps. 39:3) – all this so that the invisible guide of the human spirit may direct back towards love of virtue our free will, which in its ignorance of the good and its obsession with passion is carried headlong into sin.

St. John Cassian

The grace of the Holy Spirit which is given mystically to every Christian when he is baptized acts and is manifested in proportion to our obedience to the commandments of the Lord. That is, if a Christian obeys the commandments of the Lord more, grace acts with him more, while if he obeys them less, grace acts within him less. Just as a spark, when covered in the ashes of fire becomes increasingly manifest as one removes the ashes, and the more fire wood you put the more the fire burns, so the grace that has been given to every Christian through Holy Baptism is hidden in the heart and covered up by the passions and sins, and the more a man acts in accordance with the commandments of Christ, the more he is cleansed of the passions and the more the fire of Divine grace lights in his heart, illumines and deifies him.

St. Nicodemus of the Holy Mountain

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

Every Christian should find for himself the imperative and incentive to become holy. If you live without struggle and without hope of becoming holy, then you are Christians only in name and not in essence. But without holiness, no one shall see the Lord, that is to say they will not attain eternal blessedness. It is a trustworthy saying that Jesus Christ came into the world to save sinners (1 Tim. 1:15). But we deceive ourselves if we think that we are saved while remaining sinners. Christ saves those sinners by giving them the means to become saints.

St. Philaret of Moscow

Christians, have we understood the great responsibility that we have taken on before God through baptism?  Have we come to know that we must conduct ourselves as children of God, that we must align our will with the will of God, that we must remain free from sin, that we must love God with all our hearts and always patiently await union with Him?  Have we thought about the fact that our heart should be so filled with love that it should overflow to our neighbor? Do we have the feeling that we must become holy and perfect, children of God and heirs of the Kingdom of Heaven?  We must struggle for this, so that we may not be shown unworthy and rejected.  Let none of us lose our boldness, nor neglect our duties, nor be afraid of the difficulties of spiritual struggle.  For we have God as a helper, who strengthens us in the difficult path of virtue.

St. Nectarios of Aegina 

Faith and love towards Christ Jesus... are the beginning and the end of life. For the beginning is faith, and the end is love. Now these two, being inseparably connected together, are of God, while all other things which are requisite for a holy life follow after them.

St. Ignatius of Antioch