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你或许曾经玩过“信任背摔（Trust-Fall）”这个游戏。参加游戏的人需要身体笔直、向后摔倒，最终倒在站在身后准备接住他的人怀中。如果你曾玩过这个游戏，你便会知道向后倒时躯体不弯是多么困难了。把自己的安危交托给一个眼睛看不见的支持者总是不容易的，我们需要有信心才能做得到。

在与亚伯拉罕结伴同走信心之旅之前，我们需要明白什么才是真正的信心。我们时常会认为信心就像一个备用汽车轮胎——在紧急情况下，我们可能需要它来帮助我们续航。于是，我们便会倾向于以某些看来较为明显和实在的事物来取代信心。

《希伯来书》十一章1节为信心下了定义：“信就是所望之事的实底，是未见之事的确据。”信心是一个坚定的信念，它关联着我们看不见或不能完全理解的事物。然而信心并非盲目的，也不是不合理性的；只不过它是超理性的，并且运行在一个不同的层面。它不会说：“我信赖人的分析。”却会说：“我信赖神。”

信心需要我们向后倒，并全然倚赖耶稣的支撑，就像攀岩的人在悬崖援绳而下时倚赖绳索那样。它意味着选择倚靠神行事。当我们这样做时，神便十分喜悦。

Maybe you've played the "Trust-Fall" game. To engage in this game, you stand straight and fall backward into the arms of someone who is standing there, ready to catch you. If you have played this game, you know how hard it is to fall back without bending your waist. Entrusting yourself to a support you can't see is never easy. It requires faith.

Before we join Abraham on his journey of faith, we need to understand what true faith is. Often we think of faith like a spare tire—something we might need in case of emergency to keep us moving on the road of life. As a result, we tend to replace faith with something that seems more tangible, more substantial.

Hebrews 11:1 defines faith as "confidence in what we hope for and assurance about what we do not see." Faith is a firm belief about something we cannot see or completely figure out. But faith is not blind, and it does not conflict with reason. It simply rises above reason and operates on a different level. It doesn't say, "In human analysis I trust." Rather, it says, "In God I trust."

Like a rope that a mountain climber uses to rappel down a cliff, faith leans back and relies wholly on Jesus. It involves choosing to act in dependence on God. And when we do, God is pleased.