"By faith Abraham, when he was tried, offered up Isaac; and he that had received the promises, offered up his only-begotten." (Heb. xi. 17.) It is only as we are walking by faith that we can begin, continue, and end our works in God. Abraham not merely set out to offer his son, but he went on, and reached the spot which God had appointed. "And Abraham took the wood of the burnt-offering, and laid it upon Isaac his son; and he took the fire in his hand, and a knife: and they went both of them together." And further on we read, "And Abraham built an altar there; and laid the wood in order; and bound Isaac his son, and laid him on the altar upon the wood. And Abraham stretched forth his hand, and took the knife to slay his son." This was real work, "a work of faith and labor of love," in the highest sense. It was no mere mockery--no drawing near with the lips, while the heart was far off--no saying, "I go, sir, and went not." It was all deep reality, just such as faith ever delights to produce, and which God delights to accept. It is easy to make a show of devotedness when there is no demand for it. It is easy to say, "though all shall be offended because of thee, yet will I never be offended ... though I should die with thee, yet will I not deny thee;" but the point is to stand the trial. When Peter was put to the test, he entirely broke down. Faith never talks of what it will do, but does what it can in the strength of the Lord. Nothing can be more thoroughly worthless than a spirit of empty pretension. It is just as worthless as the basis on which it rests. But faith acts "when it is tried;" and till then it is content to be unseen and silent.