Often the children of God cannot rise up to answer the Lord's call to service simply because, though their physical condition is good, their feelings are low, cold, and reluctant. Or even when their emotions are quite high, passionate, and willing, they find themselves unable to serve the Lord because now the body reacts lazily. The disciples found themselves in precisely that situation in the Garden of Gethsemane: "the spirit indeed is willing, but the flesh is weak"
Watchman NeeIf you perform your part, God will fulfill His. And once you put off specifically, you should just as thoroughly believe that God will renew your mind, despite the fact you know not how.
Watchman NeeTo walk after the spirit a believer must inhibit his mind from revolving endlessly. If it turns too long around one topic, worries or grieves too much over matters, and ponders too intensively to know God's will, it may become unbearable and hamper its normal operation. The mind needs to be kept in a steady and secure state.
Watchman Nee