Alright! I found the quotes I was looking for:
"We cannot overemphasize the value of temple marriage, the binding ties of the sealing ordinance, and the standards of worthiness required of them. When parents keep the covenants they have made at the altar of the temple, their children will be forever bound to them."
(Boyd K Packer in Conference Report, Apr. 1992, 94-95)
"The Prophet Joseph Smith declared-and he never taught more comforting doctrine-that the eternal sealings of faithful parents and the divine promises made to them for valiant sevice int he Cause of Truth, would save not only themselves, but likewise their posterity. Though some of the sheep may wander, the eye of the Shepherd is upon them, and sooner or later they will feel the tentacles of Divine Providence reaching out after them and drawing them back to the fold. Either in this life or in the life to come, they will return. They will have to pay their debt to justice; they will suffer for their sins; and may tred a thorny path; but if it leads them at last, like the penitent Prodigal, to a loving and forgiving father's heart and home, the painful experience will not have been in vain. Pray for your careless and disobedient children; hold on to them with your faith. Hope on, trust on, till you see the salvation of God"
(Orson F. Whitney in Conference Report, Apr. 1929, 110)
"Let the father and mother, who are members of this Church and kingdom, take a righteous course, and strive with all their might never to do a wrong, but to do good all their lives; if they have one child or one hundred children, if they conduct themselves towards them as they should, binding them to the Lord by their faith and prayers, I care not where those children go, they are bound up to their parents by an everlasting tie, and no power on earth or hell can separate them from their parents in eternity; they will return again to the fountain from whence they sprang."
(Brigham Young in Journal of Discourses, 11:215)
Children born under the covenant, who drift away, are still the children of their parents; and the parents have a claim upon them; and if the children have not sinned away all their rights, the parents may be able to bring them through repentance, into the celestial kingdom, but not to receive the exaltation. (Joseph Fielding Smith Doctrines of Salvation, 2:91)
There are very few whose rebellion and evil deeds are so great that they have sinned away the power to repent. That judgment must also be left up to the Lord. He tells us, I, the Lord, will forgive whom I will forgive, but of you it is required to forgive all men. (James E. Faust Conference Report, April 2003, p. 68)
Repentant wayward children will enjoy salvation and all the blessings that go with it, but exaltation is much more. It must be fully earned. The question as to who will be exalted must be left to the Lord in His mercy. (James E. Fauth Conference Report, April 2003, p. 68)
Yes, in the next life we will have our wives, and our sons and daughters. If we do not get them all at once, we will have them some time, for every knee shall bow and every tongue shall confess that Jesus is the Christ. You that are mourning about your children straying away will have your sons and your daughters. If you succeed in passing through these trials and afflictions and receive a resurrection, you will, by the power of the Priesthood, work and labor, as the Son of God has, until you get all your sons and daughters in the path of exaltation and glory. This is just as sure as the sun rose this morning over yonder mountains.
Therefore, mourn not because all your sons and daughters do not follow in the path that you have marked out to them, or give heed to you counsels. Inasmuch as we succeed in securing eternal glory, and stand as saviors, and as kings and priests to our God, we will save our posterity. . . . God will have His own way in his own time, and He will accomplish His purposes in the salvation of His sons and daughters. . . . God bless you, brethren and sisters. Do not be discouraged is the word I wish to pass to you. . . . (Lorenzo Snow address delivered 6 Oct. 1893; in Stuy, Collected Discourses, 3:364-65)
There are some more quotes on this page:
http://emp.byui.edu/WIGHTMANG/Bom_121/Class_Articles/Sealing_Power.htm