One measure of a healthy life of prayer is that it never seeks a sign. Prayer should never be an effort to control or manipulate how God acts in our lives. It is not a means to an end but an end in itself.
from The Little Way of Lent by Gary Caster (emphasis my own)
Prayer is the deliberate and steadfast action of the soul. It is true and enduring, and full of grace. Prayer fastens the soul to God and makes it one with His will.
from Revelations of Divine Love by Julian of Norwich
Beloved, pray for us.
1 Thessalonians 5:25 (The Life with God Bible NRSV)