The true aim of our Christian life is the acquisition of the Holy Spirit.
St Seraphim of Sarov
Saint Innocent Enlightener of Alaska, Metropolitan of Moscow
Without faith in Jesus Christ no one can return to God and enter the Kingdom of Heaven. No one, even though he believe in Jesus Christ, can regard himself to be His disciple and share His glory in Heaven if he does not act as Jesus Christ did. And no one is able to follow Jesus Christ if he does not receive help from the Holy Spirit…
A disciple of Christ must follow Him. We must strive to live and act as He lived and acted. For example, Jesus Christ always thanked His Heavenly Father and constantly prayed to Him. Thus we also should constantly thank God and pray to Him in all circumstances.
Prayer is the simplest, surest, and most available means to receive the Holy Spirit. Because we are composed of body and soul, they both should participate in prayer. The primary elements of prayer are concentration and sincerity, which are attained by inner effort.
But to achieve concentration and warmth during prayer is not easy. In addition, you must strive to warm your heart with love for God. Only a sincere prayer brings comfort and peace to the heart. All the righteous ones strove throughout their lives to learn the art of prayer. Nevertheless, your personal effort is not enough. It is the Holy Spirit who makes our prayer to be fervent and to come from the bottom of our heart. This was well known to the saints who, inspired by the Holy Spirit, stood day and night in prayer in sweet rapture, failing the while to notice the time fleeting away.
Pray even though at first your prayer may be weak and imperfect because of your sinfulness and estrangement from God. Pray with diligence and fervor; train yourself to be sincere in your conversation with God. Thus, little by little you will learn to pray and will start to feel a sweet comfort. The Holy Spirit will have mercy on you and will come and reside in you if you show faithfulness in your efforts at prayer.
The Holy Scripture teaches: Pray without ceasing (1 Thess. 5:17). How is this possible for people living in a secular world? If you are to pray all the time, how then are you to perform your other duties? The advice of perpetual prayer is directed not toward outward but toward inner prayer. If desired, you can turn to God internally whether you are alone or with others. Only he who does not want to pray will not find time for prayer.
The Holy Spirit grants true fervent prayer. Until they receive the Holy Spirit, people cannot pray in a manner truly pleasing to God because they cannot control their scattered thoughts and feelings. Christians in whom the Holy Spirit resides, however, vividly feel the presence of God; their prayer flows evenly, and they know how and for what to ask God. In this inspired state, they can beseech God for anything, even the seemingly impossible.
In summary, it is impossible to enter the Kingdom of Heaven or even come close to it without the assistance of the Holy Spirit. Therefore, we should implore the Holy Spirit with all earnestness to come dwell in us and help us, just as He helped the Holy Apostles.
The Grace of the Holy Spirit is a gift of His endless mercy. And gifts by definition are given when it suits the giver, and only those deemed suitable by the giver.