Do only what you can. This is what God wants. The God Himself will make up for the rest with His grace. For there is also the fear of despair by reading the sublime levels that the saints have reached.
Go ahead in spiritual life humble-minded and God will not abandon you. Do not try to reach spiritual states that go beyond your powers, for you will definitely fall and your fall will be exploited by the devil.
Isaac the Syrian
*The article was originally published in Greek in ikivotos.gr