In order to prevent these blocks/distractions one should concentrate on a single truth.
A definition of both the devil and hell is an undisciplined mind. A dispersed mind achieves no depth whether pragmatically, philosophically or spiritually. Inner Awareness can only grow when the mind is directed inwardly with energy and perseverance. Hence the importance of daily relentless Sadhana under the auspices of a living bona fide Spiritual Mentor (Guru) who gives tested methodologies and techniques as per the capacity, capability and understanding of the student and who can provide both feedback and guidance.
Everything operates in cycles and hence the importance of Regularity, Rhythm and Repetition (the 3Rs) in everything that we do to develop skills and mastery. Once we have discipline in place then it is a matter of maintaining awareness, being totally present in our Sadhana while ever keeping the Goal in Mind (Moksha, Blessing of the Devata, Realization that there is no self but the Self) is what will stop us from being mechanical and bring constant freshness in both our Spiritual Practices and our lives.