Then said he unto me, Fear not, Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words.
Fear not - be not affrighted at my presence.
For from the first day that thou didst set thine heart to understand - what shall come to pass to thy people at the last times (cf. Daniel 10:14). And to chasten thyself before thy God - (Daniel 10:2-3).
Thy words were heard - (Acts 10:4, an angel said to Cornelius, "Thy prayers and thine alms are come up for a memorial before God"). Prayer is heard at once in heaven, though the sensible answer may seem to be delayed. God's messenger was detained on the way (Daniel 10:13) by the opposition of the powers of darkness. If in our prayers amidst long protracted sorrows we would believe that God's angel is on his way to us, what consolation it would give us!
And I am come for thy words - because of thy prayers.