While the Tzaddik may rule over his heart and even the Beinoni can tap into the love of God through the Tevunah (“understanding”) that exists within his mind, the Rasha (evil person) must have another way to come to love God.
This is through the hidden love that exists within him. Everyone has this love. It is a gift from our forefathers. The love is hidden and in a state of sleep within the Rasha. But when certain moments come about – such as when he must literally give up his life in self-sacrifice, rather than separate from God and commit the particular sin which he is forbidden to do, the Chochma within him awakens from its sleep.
Suddenly the Rasha realises that he cannot be separated from God for even a moment, and succumbs to the martyrdom rather than perform the evil deed.
Now – he will need to learn how to tap into the hidden “sleeping” love, so that he will ultimately be able to use it to prevent himself from committing any sin against God. Once he realises that every sin tears one away from God – just the same way as that sin of worshiping idols (for example) – he will be able to hold himself back from committing any sin against God. This we will learn about more in the upcoming chapters of Tanya.