Worth mentioning, only because modern Orthodox sometimes oppose to the notion of meditating upon the Passion of Christ because it's so associated with Western Christendom. Here are some witnesses from Early Church Fathers from the East.
St. Ephrem the Syrian, On the Passion
Learn well, brother, what it is you hear:
God who is without sin, Son of the Most High,
for you was given up.
Open your heart, learn in details His sufferings and say to yourself:
God who is without sin
today was given up,
today was mocked,
today was abused,
today was struck,
today was scourged,
today wore a crown of thorns,
today was crucified,
he, the heavenly Lamb.
Your heart will tremble, your soul will shudder.
Shed tears everyday by this meditation on the Master's sufferings.
Tears become sweet (for) the soul is enlightened that always meditates on Christ's sufferings.
Always meditating thus, shedding tears every day,
giving thanks to the Master for the sufferings that he suffered for you,
so that in the day of his Coming your tears may become your boast and exaltation before the judgment seat.
Endure as you meditate on the loving Master’s sufferings,
endure temptations, give thanks from your soul.
Blessed is the one who has before his eyes
the heavenly Master and his sufferings,
and has crucified himself from all the passions
and earthly deeds,
who has become an imitator
of his own Master.
St. John Chrysostom, Homilies on St. Matthew 87
These things then let us read continually; for indeed great is the gain, great the advantage to be thence obtained. For when thou seest Him, both by gestures and by deeds, mocked and worshipped with so much derision, and beaten and suffering the utmost insults, though thou be very stone, thou wilt become softer than any wax, and wilt cast out of thy soul all haughtiness.
...Hearing then these things, let us arm ourselves against all rage, against all anger. Shouldest thou perceive thy heart swelling, seal thy breast setting upon it the cross. Call to mind some one of the things that then took place, and thou wilt cast out as dust all rage by the recollection of the things that were done. Consider the words, the actions; consider that He is Lord, and thou servant. He is suffering for thee, thou for thyself; He in behalf of them who had been benefited by Him and had crucified Him, thou in behalf of thyself; He in behalf of them who had used Him despitefully, thou oftentimes at the hands of them who have been injured. He in the sight of the whole city, or rather of the whole people of the Jews, both strangers, and those of the country, before whom He spake those merciful words, but thou in the presence of few; and what was more insulting to Him, that even His disciples forsook Him. For those, who before paid Him attention, had deserted Him, but His enemies and foes, having got Him in the midst of themselves on the cross, insulted, reviled, mocked, derided, scoffed at Him, Jews and soldiers from below, from above thieves on either side: for indeed the thieves insulted, and upbraided Him both of them. How then saith Luke that one “rebuked?” Both things were done, for at first both upbraided Him, but afterwards one did so no more. For that thou mightest not think the thing had been done by any agreement, or that the thief was not a thief, by his insolence he showeth thee, that up on the cross he was a thief and an enemy, and at once was changed...
Considering then all these things, control thyself. For what sufferest thou like what thy Lord suffered? Wast thou publicly insulted? But not like these things. Art thou mocked? yet not thy whole body, not being thus scourged, and stripped. And even if thou wast buffeted, yet not like this.
[Sources from the blog Western Rite Orthodoxy:
http://westernorthodox.blogspot.com/2008/03/st-ephrem-syrian-meditate-on-passion-of.html
http://westernorthodox.blogspot.com/2008/04/st-john-chrysostom-meditate-on.html?m=1
