You change your life by changing your heart.

In Lucado’s Christian idiom, “heart” functions as shorthand for the inner self—desires, loyalties, and will—rather than mere emotion. The line asserts that durable life-change is not primarily achieved by external adjustments (new habits, environments, or resolutions) but by an inward reorientation: what one loves, trusts, and aims at. It echoes a biblical theme that conduct flows from the heart (e.g., speech and actions as outgrowths of inner commitments). The quote’s significance lies in its moral psychology: transformation is presented as an inside-out process, where spiritual renewal precedes and empowers behavioral reform.