Morning prayer as is clear from many of the elements that make it up, is intended and arranged for the sanctification of the morning. Saint Basil the Great give an excellent description of its character in these words:
"It is said in the morning in order that the first stirring of our mind and will may be consecrated to God, and that we may take nothing in hand until we have been gladdened by the thought of God, as it is written: 'I was mindful of God and was glad' (Psalm 77:4), or set our bodies to any task before we do what has been said 'I will pray to you, Lord, you will hear my voice in the morning; I will stand before you in the morning and gaze on you' (Psalm 5:4-5)".
When evening approaches and the day is already far spent, Evening Prayer is celebrated in order that we may give thanks for what has been given us or what we have done well, during the day. We also recall the redemption through the prayer which we send up like incense in the Lord's sight and in which the raising up of our hands becomes an evening sacrifice.
This may be understood also in a deeper spiritual sense of that true evening sacrifice which, as is handed down to us, was offered in the evening by the Lord at supper with the apostles, when He instituted the Most Holy mysteries of the Church, or of the evening sacrifice, that is, the sacrifice at the end of the ages, in which on the next day he was offered to the Father as he raised up His hands for the salvation of the whole world.
Again, in order to fix our hope on the light that knows no setting, we pray and make petition for the light to come down on us anew and ask Christ to give us the grace of eternal light.