I heard this first quote today. Looked it up, and it set off a chain of thought that led to the rest of the quotes below. Hopefully the message itself is not discombobulated and you find it helpful.
(Note: This is by no means an exhaustive list. So if you have any inspirational quotes along this theme that I missed, please include them in the comments section below! :)
“To each there comes in their lifetime a special moment when they are figuratively tapped on the shoulder and offered the chance to do a very special thing, unique to them and fitted to their talents. What a tragedy if that moment finds them unprepared or unqualified for that which could have been their finest hour.” —Winston Churchill
"Indeed the safest road to Hell is the gradual one—the gentle slope, soft underfoot, without sudden turnings, without milestones, without signposts…." —C.S. Lewis
So…how to prevent such a fate, whether on a spiritual, social, or other level?
"By small and simple things are great things brought to pass" (Alma 37:6).
"Sow a thought and you reap an action; sow an act and you reap a habit; sow a habit and you reap a character; sow a character and you reap a destiny." —Ralph Waldo Emerson
"Decisions now to exercise faith and be steady in obedience will in time produce great faith and assurance. That is the spiritual preparedness we will all need. And it will qualify us in the moments of crisis to receive the Lord's promise that 'if ye are prepared ye shall not fear.'
"That will be true when we face the storms of life and the prospect of death. A loving Heavenly Father and His Beloved son have given us all the help They can to pass the test of life set before us. But we must decide to obey and then do it. We build the faith to pass the tests of obedience over time and through our daily choices. We can decide now to do quickly whatever God asks of us. And we can decide to be steady in the small tests of obedience which build the faith to carry us through the great tests, which will surely come." —Henry B. Eyring
"He that is faithful in that which is least is faithful also in much: and he that is unjust in the least is unjust also in much" (Luke 16:10)
“Watch your thoughts; they become words. Watch your words; they become actions. Watch your actions; they become habit. Watch your habits; they become character. Watch your character; it becomes your destiny.” —Lao Tzu
"There are many of us that are willing to do great things for the Lord, but few of us are willing to do little things." —Dwight L. Moody
"And he did straiten them in the wilderness with his rod; for they hardened their hearts…; and the Lord straitened them because of their iniquity…and after they were bitten he prepared a way that they might be healed; and the labor which they had to perform was to look; and because of the simpleness of the way, or the easiness of it, there were many who perished" (1 Nephi 17:41)
"O my son, do not let us be slothful because of the easiness of the way; for so was it with our fathers; for so was it prepared for them, that if they would look they might live; even so it is with us." (Alma 37:46)
"Everyone is trying to accomplish something big, not realizing that life is made up of little things." —Frank Clark
"How can we prove our willingness to sacrifice all things, if need be, if we do not make the small sacrifices of time and toil, or of money and means, that we are now asked to make?" —Bruce R. McConkie
"I try to do the right thing at the right time. They may just be little things, but usually they make the difference between winning and losing." —Kareem Abdul-Jabbar
"Stand as witnesses of God at all times and in all things, and in all places that ye may be in, even until death." (Mosiah 18:9, emphasis added)
"One of the greatest reasons people cannot mobilize themselves is that they try to accomplish great things. Most worthwhile achievements are the result of many little things done in a single direction." —Nido Qubein
"Isn't it strange that princes and kings / And clowns that caper in sawdust rings / And just plain folks like you and me / Are builders for eternity? / To each is given a bag of tools, / A shapeless mass and a book of rules, / And each must build ere life has flown, / A stumbling-block or a stepping stone." —R.L. Sharpe, quoted in Boyd K Packer's "The Unwritten Order of Things"
"The major work of the world is not done by geniuses. It is done by ordinary people, with balance in their lives, who have learned to work in an extraordinary manner." —Gordon B. Hinckley